a5 Sim network problem

[msa88]

i have a50 with two sim cards 

in my area the network is too low 

i know that the mobile trys many time to stringth it and gain connection 

but after some time , there is a msg that sim card is removed or cant be connected 

and it acts as is not inserted 

i tried to solve the problem by restarting the mobile and the connection reterned 

sure it not a final solution . 

is there any another solution to this problem ?or any update ?