Something is definately eating all cpu or memmory resources..
As indicated, it could be a wifi connection, but also many things else..
If you have a good backup with you, i would try a full fledged factory reset,
Then test if the Genos works okay to elliminate any hardware issues.
Then reload your backup and see if the problem consistss.
If its back, you know there is a setting/file making this happen.