Player disconnecting

I am using LMS 8.2.0 on a Pi 4 using piCorePlayer. When listening, players have started 'dropping off' and it's a couple of minutes before they start up again. At first I thought it was a wifi issue (as the player I use most is a Pi 4 based one connected via wifi) but it's also started happening to an ethernet connected Mu-so. The LMS is connected by ethernet. It is happening both with radio streams and when listening to music from my Synology (also connected by ethernet).

Not sure what's happening so any advice gratefully received.