My portable air con was going berserk as well when everything came back and woke me up s I believe it’s effecting everything at my place, not just the lights.

I’ll try turning off the mains when i get back home and leave it for a bit.

I only turned it off for a few seconds and then turned it back on this morning before I left for work.

Maybe I didn’t leave it off for long enough the first time I tried it.