My question is: is it a normal behaviour from google or is there something I did that cause the behaviour?
I checked pihole also, thinking it could cause issues but it seem not related to it.

As calendar I use the basic one and the EXT3

Here is the log, thanks

/home/MYMM/.pm2/logs/MagicMirror-error.log last 15 lines:
0|mm | }
0|mm | }
0|mm | [2025-06-24 12:47:20.521] [ERROR] Calendar Error. Could not fetch calendar: https://calendar.google.com/calendar/ical/MYCAL.ics TypeError: fetch failed
0|mm | at node:internal/deps/undici/undici:13502:13
0|mm | at process.processTicksAndRejections (node:internal/process/task_queues:105:5) {
0|mm | [cause]: AggregateError [ETIMEDOUT]:
0|mm | at internalConnectMultiple (node:net:1139:18)
0|mm | at internalConnectMultiple (node:net:1215:5)
0|mm | at Timeout.internalConnectMultipleTimeout (node:net:1739:5)
0|mm | at listOnTimeout (node:internal/timers:596:11)
0|mm | at process.processTimers (node:internal/timers:529:7) {
0|mm | code: ‘ETIMEDOUT’,
0|mm | [errors]: [ [Error], [Error] ]
0|mm | }
0|mm | }