My 0.4.5.10 relay restarts after 4-5 days. No warnings in the log file.
The hardware is ok, Raspberry Pi 4. Has worked before.
Ddos attack?
Now restart after 1-2 days. 
Oct 11 00:00:33.000 [notice] Tor 0.4.5.10 opening new log file.
Oct 11 05:49:35.000 [notice] Heartbeat: Tor's uptime is 12:00 hours, with 49858 circuits open. I've sent 49.03 GB and received 47.74 GB. I've received 343109 connections on IPv4 and 0 on IPv6. I've made 13123 connections with IPv4 and 0 with IPv6.
Oct 11 05:49:35.000 [notice] While not bootstrapping, fetched this many bytes: 9665347 (server descriptor fetch); 540 (server descriptor upload); 897336 (consensus network-status fetch); 152995 (microdescriptor fetch)
Oct 11 05:49:35.000 [notice] Circuit handshake stats since last time: 356/356 TAP, 1636068/1640243 NTor.
Oct 11 05:49:35.000 [notice] Since startup we initiated 0 and received 0 v1 connections; initiated 0 and received 0 v2 connections; initiated 0 and received 0 v3 connections; initiated 0 and received 286956 v4 connections; initiated 9651 and received 39259 v5 connections.
Oct 11 05:49:35.000 [notice] DoS mitigation since startup: 19 circuits killed with too many cells. 256486 circuits rejected, 156 marked addresses. 0 connections closed. 0 single hop clients refused. 672936 INTRODUCE2 rejected.
The last line, “672936 INTRODUCE2 rejected”, sounds bad?
Regars Guybrush
It may be that OS restarts process because it uses too much RAM.
During DDoS relays started to consume more RAM, than usually, maybe you have not enough it to withstand DDoS.
Can you try: 1. Monitor RAM usage of your computer. 2. Install latest version of Tor (there were fixes for RAM consumption in it).
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Installing the latest version of Tor solved the problem. Also fixed the automatic update so now Tor should update automatically. Thanks