My issue appears to have been resolved by doing a cache cleanout. When I rebooted after the cleanout, the issue was still present, but then I changed the screen timeout to 5 minutes and all has been well since. Did another reboot and it's still working fine. So thankful this worked. Fingers crossed the issue doesn't pop up again. Thanks for all the advice on here. Hope everyone else can get to the bottom of their problem.
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