Well, all I can say is I like Korg gear. I have plenty.
Korg nano KONTROL, KEY, PAD.
DS-8(considered to be the better keyboard to the Yamaha DX-7, but didn't get the respect!)
M3-R(stripped down original M1-R) with RE-1 editor
Wavestation SR
DDD-5 drum machine
KMX-112 12-channel keyboard mixer
and I think some other Korg stuff, including pedals.
So, I can say I like Korg.
My initial thoughts were, "gee, this sounds like a power issue". You're also lucky you didn't lose your SD card. Make a copy of that ASAP.
Now you have to look at other things around you.
You're using all LED lighting. Good. But, LED lighting has a tendency to be electrically noisy. It's to the point where many tours using large LED walls were complaining that the RF generated by these big assemblies was causing drop-outs and interference with WIFI networking(you'd be sickened to see how much they are relying on unreliable technology these days), wireless IEM's and wireless mics. I won't go into some of the more amusing solutions to resolve these problems outside of saying sometimes it was expensive.
First, we all know keyboardists, outside of those with large on-stage guitar and bass rigs, tend to be the largest power draw due to necessity. As a result, it's always wise to take steps like you're taking by getting a power conditioner. An expensive solution, but a recommended solution for virtually any rig that draws electricity. Plus, all my power protection is Furman, so we're both like minded.
Now, in an ideal world, which we know clubs aren't, this is how things should go if possible if it were a big show:
Mains, backline, monitor land and FOH are typically all one one huge transformer and power distro, providing a common ground, but more importantly, isolation from lighting.
Lighting is on it's own transformer and power distro. Why? Well, lighting can be quite the power pig. Also, some lights can be noisy, especially LED's. Since lighting and sound can and do work side by side, it's important that they try not to touch from an electronic point of view.
Let's face it, clubs can't be bothered to take such efforts. It costs money. Even with 1 large transformer to provide 3-phase access, you can load things on different phases to try to mimimize noise issues. But putting in that gear is expensive and then as an act, you have to provide your own distro, which can be quite expensive. I'm researching getting one of these distros for myself, but honestly, where I go, it's not needed for the most part.
So, short of that, the best bet is to plug your gear into different circuits. This is what I try to do:
Lights are one circuit, sometimes two. Since I'm moving to LED as much as possible, it's made this much easier to deal with. If I use 2, it's because my follow spots.
Mains are on another circuit if I'm doing large shows. If really big shows, I need 4 20-amp circuits and 2 15's for mains.
Monitors and backline are often on the same circuit. If the acts are using in-ears, I don't need as much power to drive floor wedges and on-stage subs with wedges.
FOH draws over 13 amps often based on load-out, so it's got to have its own circuit.
Now, chances are you're doing the 200 peeps and below thing as most clubs are dinky.(not an insult, just an observation based on around where I live). Your FOH/Monitorland/Monitors/backline and maybe even mains should be one or 2 circuits. Your lighting(and controller) should be a different circuit. If you can, use something like a Furman Merit-series power unit because A: they are cheap, B: they are great units that provide filtering and surge protection. Going both ways, they help clean things up on the power line and minimize SOME of this noise. Merit units can start at $50 for no front panel lighting bar and display. For my racks, I am moving to units that all have front panel display(most do) but also front panel plugs. Almost all the ones I have also have the pull-out lights, which for me are an absolute necessity.
Now, I know Elation makes power distro products. ADJ makes the rack-type power strips(like the Furmans). I can't recommend the Elation stuff because it's overkill for what you want and some requires specialty electrical connections. I don't recommend the ADJ rack power strips because I am totally into Furman for that and will not change. Almost every tour I've seen, done and worked with, it's been Furman almost exclusively.
Don't assume that different outlets are different circuits. I have a device that plugs into the outlet, then you go to the service panel and use the receiver element to find which breaker that sending device is plugged into. It works good. The problem is some places won't let you go anywhere near their service panel. They just get angry when you pop their breakers.
Which reminds me of an event. The rented generator was out of power to run anything else, so we had to tap into house power on two nearby businesses, and we kept popping their breaker because they refused to give us a dedicated circuit. Even front-ending my stuff off a Furman unit didn't help because my load was under 15 amps and they had some sort of heater or something on that circuit. So, having your own front end you can have your breaker pop and not the house's so you can reset and keep on going.