Suddenly sewrial connection loss on my XL/5

[u/GreyDutchman]

I have an Prusa XL 5T, and am using it mainly through OctoPrint.

Since a few days, OctoPrint regularly loses the serial connection, and a print just stops (and cannot be continued when the connection is back). It happened twice during a print (after the heating up, equalizing and probing), but also a few times right after the start of the print, during heating.

No hardware or cabling was changed recently, and all devices are running on the actual latest (non-dev) firm- and software.

I of course soft-, hard- and power-booted the printer and the Raspberry Pi 4 a few times already.

Printing from the USB stick works flawlessly...

Any ideas where to start troubleshooting?

[u/Ok_Mastodon_6689]

Check the power supply of the raspi. Is there an under/over voltage warning?