My keyboard suddenly keeps on typing the ~ symbol continuously even a key being pressed.  I have tried to do all of the following and the problem is still happening (i.e., none of these work)

1. unpair and repair with laptop - same problem

2. tried connecting with other devices (phone Samsung S10+, and desktop PC) - same problem

3. factory reset (fn + left shift + backspace) - same problem

4. set Windows 10 keyboard setting key repeat to slow and long - same problem.

Please help - what else can I do to get this working?  I really like this keyboard.