FP2 keeps losing wifi key

Can anyone advise please? Several times in the last few days when I’ve woken my phone up from sleep it has failed to reconnect to my wifi network, and has asked for the wireless key again. If I reboot it finds the key again. I haven’t made any changes to the phone recently, apart from standard updates to apps and operating system (running Android).
Has anyone else had this problem, or found a solution?
Thanks

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