Computer is getting stuck


My i-symcom sometimes stops, and i need to make a restart, i did make a instalation with 4 gateways X-comfort. in the home i have fritzbox wire less with 4 transmitters what i put in the 220volt. when i use the I-pad and stay in one room it is ok, when i go walk the problem is he would to shwits but sometimes it works and sometimes not. i think becaus he shwitch over to a other reciever from fritzbox, and i think at this time the computer sometimes become this problem (i don,t know for sure).

i did already make a update from ip-symcom but it was ok.

what can it be?

thanks Ron.

sorry my german is more bad as my english.