Tubes are acting like Microphones on the P-2

[Johnny_Infinity]

I recently got a p-2 and for the first few week it was working great, however for the last few days, it seems to be acting like a microphone, if i tap on the table, case or tubes it picks it up and sends it to the headphones.

Is there a fix for this?

 

[Leonidas_k]

Besides the obvious "do not tap on the table" (Sorry, could help my self ), you can check if something any tube some how got loose, if something like that is possible.
Other than that, the next best thing I believe would be to use some isolating material to decouple the P-2 from the table.