Iphone 7 - no hombutton feeback - no vibration - no alarm

I recently got IPhone 7 Plus and I experience a few problems:

If the phone gets wet then vibration, feedback when clicking the home button and vibration when silencing the phone stops working for anything between 1 and 10 hours. Sometimes however restarting the phone solves the problem.

Today the alarm also stopped working.

Other than that phone works normally.

I have even experieced that when the phone connected over bluetooth to the car radio vibration started to work again.

1. Am I the only one in the world who have tried that

2. What should I do