modicon quantum plc of scheneider

hello, we are using modicon quantum plc and its progrraming software concepr2.2, we have one repeated problem from last many days that our controller get hanged automatically anf after some time it get reset ,also its some drop input card get flickermeans because of card hold unhold position many of feeders digital output get on /off.so please any one can give me some solution.

Normally theres two things that cause the plc to "hang". Watchdog overflow or there is a problem with the supply to the plc. While it is in the fault state connect to it and check the cpu for reasons.