Soundtouch 10 drops wifi connection but other 10 and 20 ok

[Solobay]

I have a 20 for the main room and 2 10's for other rooms in the house
one 10 and the 20 stay connected to the wifi
But the last 10 seems to continually drop out and need reset from start - bizarrely it is the nearest to the router too!
Any ideas

[Solobay]

Should have said wifi light is blinking white

[Solobay]

Did nothing left it overnight and bingo its working again