CA600 Keeps turning on lights automatically

Hurricane knocked out power so I have my generator (8000w pk) running. Every 10 minutes or so, the lights turn back on! Anyone know why? My assumption is that slight power fluctuations is causing it to think it looses power, but then i would expect it to return to itd state prior to loosing power, which would be the off state!? This is really annoying…anyone else see this issue?