Strange wifi issue in new mm update

I recently came back from Dr ketan mm build 3 to stock rom 6.0.1 for n910g iju so for new may patch in setting under development section I am seeing new option for networking as shown in screens hots.
When I got back suddenly my wifi behaving strange sometimes it works sometimes it doesn't .I don't know why.before coming back to stock I wiped all data and cache everything.i don't know may be it's bcs of this new setting or what?has anyone else experienced this problem?


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