Nokia5200 wht is sw

I am using Nokia 5200 cell phone for the last 6 months.Suddenly voice problem started as it is a flip phone the material base is very soft .If the other party calls me I can not hear the ring tone.when i contacted the service centre they told me that under the Keypads there is a case that holds the cover with 2 small clips ,that is broken which is difficult to find so better apply some adhesive or feviquick , After a month now the problem is of signal.My cell sometimes show no signal or shows only one bar of signal, Temporarily this can be sorted out if I press the phone between the "GO TO" KEY AND THE "GREEN ANSWER KEY" it comes with full signal.then after some times there will be no signal.Can anyone tell what will be the problem ?