Multiple restart Umbrel.local

I don’t understand the reason why my Umbrel restart (on Raspberry 4)his system several time during the day.
The system restart itself, and in the logs I dont find any reason.
– Boot 2d5941155bda47c99a4afbbeb4575c89 –
May 08 05:58:38 umbrel systemd[1]: Started umbrel.service - Umbrel daemon.
May 08 05:59:07 umbrel umbreld[2078]: [umbreld ] :open_umbrella: Starting Umbrel v1.1.0

Apparently Rspb doesn’t have power or hardware issue.

How can I deepen the analysis?

Let me make sure I understand. You are saying your friends raspberry pi is rebooting by itself?
I would check the power supply. Make sure its the one made for the RPi unit.
And then I would check the plug and make sure its a tight fit. Perhaps a pet or tiny human is playing with it.

Sometimes the power supply gets loose.

it’s not a power issue. Raspberry always respond a local ping.
Sometimes system goes stuck and Umbrel doesnt permit ssh connection or is not possibile resolve and connect via gui/ssh at umbrel.local

morigies@MBA ~ % ssh
kex_exchange_identification: read: Connection reset by peer
Connection reset by port 22

morigies@MBA ~ % ping
PING ( 56 data bytes
64 bytes from icmp_seq=0 ttl=64 time=6.214 ms
64 bytes from icmp_seq=1 ttl=64 time=3.322 ms
— ping statistics —
2 packets transmitted, 2 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 3.322/4.768/6.214/1.446 ms

morigies@MBA~ %
morigies@MBA ~ % ping umbrel.local
ping: cannot resolve umbrel.local: Unknown host