My raspberry pi 4 NAS is having often network disconnections. All services (SMB, SSH, etc..) are not reachable for a few minutes, it cannot be pinged, then everything works again.
This might happen more frequently at times when there is higher network traffic, for instance during a Time Machine backup or other file transfer via SMB. Also, it seems that the problem happens more often when the transfers are via wifi compared to ethernet.
I tried to look for an explanation in the log files but could not find much related information there.
Do you have any recommendation on how to investigate the issue, or any possible explanation?
Thanks for any hint