Yesterday (March 18th) I noticed that my phone began auto-rebooting literally every 5 seconds. Lock screen would come up, I get maybe 5 seconds before screen went black with an Asus logo, a Zenfone screen then comes up, then lock screen for 5 seconds and repeat. I've learned that the problem stops when I disconnect from any internet access, so if Wifi/Data is off, the phone is fine. I can call, text, get GPS, nothing seems off, but if I turn Wifi or data back on, the problem instantly comes back.
I also tried removing the SIM card, which does resolve the issue. The phone can connect to Wifi and no auto-reboot problem comes up. Any ideas of what would cause this? A redditor here had a similar issue and thought it might have come from updating from Android 13 to 14? They also said that the issue resolved itself after opening some storage up. I have ~50 Gb free, I don't really think that's the issue.
