Key strokes not working happen under two circumstance for me. the first has been discussed, if you leave the call in progress screen it will not accept the keys. This works as it should since it assumes you are trying to do something else while on the phone since you left the screen. The other one to watch for is if your phone is locked and you accept a call you will not be able to enter any keys. I live in a gated community and I have to unlock before I can buzz people in.
If neither of those represent your issue and your DTMF is on, then try the soft reset. If it happens again I would consider exchanging the phone because I have not had that issue on either of the two Qs I had.
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