Odd situation

I have four cameras all on same network. All of sudden two say they are off line.

I tried unplugging and plugging back in. The cameras will light up if it picks up movement but will not record event or send to app

nothing changed, these two just decided to go offline

No firmware or app update recently? Are they flashing red/blue as if they’re trying to connect to wifi?

Try a different power block, maybe there was a surge that has partially damaged them (hopefully just the block if so).

Also try power cycling your WiFi router.