Hi, I haven’t seen this.
[EDIT - After checking, yes I did see this once or twice.
For me, restarting the phone was sufficient to get rid of the problem.
I didn’t notice any association with Bluetooth.
There is also another topic on a similar subject here but it’s about FP6, not FP5. @Digimon Would you say your problem is the same?]
Make sure you raise a ticket with official Support. contactsupport
Which update?