Phone is unplugged from USB
Lock the phone and resume several times, all fine.
Press power and this time allow at least 1 min for it to suspend
Resume phone, first time is ok
Lock - pause - resume second time phone screen locks up
Try again and screen locks again, it seems to stay in the bad state for awhile.
I reproduced fairly quickly as follows:
Phone is unplugged from USB
Lock the phone and resume several times, all fine.
Press power and this time allow at least 1 min for it to suspend
Resume phone, first time is ok
Lock - pause - resume second time phone screen locks up
Try again and screen locks again, it seems to stay in the bad state for awhile.