Airtel Xstream router auto disconnects, TR069 suspected

I am having auto restart problem after midnight. Does disabling tr069 in access control work? or is unlocking necessary?
 
There is an option in Access control under Security tab along with telnet, ICMP, SSH etc. for tr069 option which i have denied. Will that work? If not what is that option even for?
 
Router: Nokia G-2425G-A
In my case I had this option on the stock router firmware to Deny TR-069 in WAN (LAN is greyed out). I set all the options to Deny on WAN at least but still it keeps rebooting. It doesn't work.

For some unknown reasons my CCTV NVR doesn't get recognized on the LAN by the router after this reboot. I have to power cycle the NVR as well and hence its a nightmare for me.
 
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