Nexus 5 dropping off the net work

[somachand]

I have Nexus 5 updated software from 4.4.2 to now 4.4.4 with all these versions I am facing one problem of dropping off the network with no signal when strong signal is available.To get into net work I have switch off the power and restart this is the Fourth time it has happened in last 3 months. What is the solution for this problem?