Oneplus 2 Wifi Connectivity Issue (with a particular Wifi Spot)

Hi Guys,

My OP2 is able to connect to My Wifi router pretty fine. I usually go to my cousin's place to hang out.

At that time, my OP2 is not able to connect to my cousin's Wifi Router. My other devices (moto g, Mi3 and my office laptop) are able to connect to it without any issues.

My OP2 is showing the Router signal, after giving password, it is showing as "Saved".

Could you please help me out here.. as i usually hang in his place during weekends..

Cheers!!!

No WiFi Connectivity After Using Mobile Hotspot

I use my Mobile Hotspot to tether my Nexus 7 tablet in my car. I am running 5.0.1 Lollipop.

As soon as I turn the car off, the Mobile Hotspot turns off and the WiFi is turned on again. The phone will connect to my home wireless hotspot but there is no data tranfer.

Instagram says "Can't refresh feed" and Chrome cannot connect to the web.

In order to fix the problem I usually need to restart the device and then it will connect to WiFi will full connectivity again.
Any ideas?
Is my Mobile Hotspot locking something up in Android, like the MAC Address or IP Address or something until I reboot?