[Q] wifi gets inactive after 1-2 minute even though it is connected to router?help

when i switch on and connect my wifi , it works well for 1 min or 5 min or even just 20-30 seconds and after that it becomes inactive. have to switch it off and then again switch. it works again for few time and then again inactive.
my phone is Intex aqua star Hd (new phone- android 4.4 kitkat)

wifi settings are:
Network notification: off
Keep wifi on during sleep: Always
Scanning always available: off
Wifi optimalization: off
Passpoint: off

pls help

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