Great, thank helps narrow down the issue. Let this case, it's possible that the problem is related to a recent software update. Let me guide you through a few more to check for any software issues. First, go to your phone's settings app, then select 'About phone', and then 'System Update'. Check if there are any updates available and install them if they're available.
Okay, I've done that. But I'm still experiencing the same issue.