After inserting the earphones and removing them the speaker on the phone faills to work unless I restart the phone
I think its software bug and it can be fixed in next update.
I have the same problem
Expected to be solved in upcoming MR update in april.
I noticed this sometimes if I remove the Headset/Earphones from Audio Jack. So, I need to restart the Phone most of the time since the problem occurred.
[NOKIA 5.1 Plus]
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