Unfortunately, it looks like your micro-controller is spontaneously resetting itself.
The Klipper host code had an error that caused the spontaneous restart report to not propagate correctly. This should, hopefully, be fixed now (commit 9ce631e8).
As to why the micro-controller is resetting itself - I’d try investigating the possibilities described at Timeout with MCU / Lost communication with MCU . You may also want to try running “make menuconfig”, compiling, and reflashing the micro-controller again.
-Kevin