[Q] Unbale to Login into Cam Scanner and OTA keeps failing topic

Hi guys I have a Galaxy S4 ATT version running 4.4.2 rooted, I have few issues that I have been trying to over come

1. I try logging into CamScanner and I get message saying "Network unavailable. Please Check your network setting of the phone"
2. OTA keeps failing and this sometimes results in lot of battery drain
3. when i try to initiate Tethering/Mobile hotspot settings keep crashing and I get message saying Unfortunately, Settings has stopped popup is displayed.

Any help here is much appreciated.
Base Band: NC1
Secure boot status: Samsung