Push reset switch panasonic nv error?

SOURCE: Push the reset button,PANASONIC NV-GS11

My NV-GS15 asks me to push the reset button every time I turn it on

SOURCE: Problem with Panasonic Camcorder NV-DS28

From speaking to a repair centre this is a very common problem with Panasonic camcorders.
I got the impression it was a panasonic problem with a connector that needed either cleaning or replacing. 
There are 2 fixes, one is cheap quick and temporary.
The other involves sending the camcorder away to be professionally repaired, it should cost the minimum fee, which was £50 in 2007.  

As for the cheap version, it involved turning the camcorder off and hitting it against a copy of the yellow pages and turning on again.  This worked for long enough to record my 2nd daughters birth.

SOURCE: reset switch of Panasonic NV-GS50 Mini DV Digital Camcorder

the sound of my sony camrecorder is gone, when i record there is no sound. so please help me fix the problem!