Hopefully someone can point me in the right direction to resolving an ongoing issue with access to non secure websites through Orcon UFB.

The problem occurs on a fairly regular basis (around 4-5 times a week) often between 12pm and 1am. When it happens I am unable to access any websites that do not have https at the beginning of the address. No other services (including voip) seem to be affected. [I'm also fairly certain that connections that are already live (such as streaming video) seem not to be affected only if trying to access another stream.] This issue happens both on wireless and Ethernet connections within my home network. If I reboot the Orcon Genius router or power off/on the problem resolves itself. Last week, due to another issue with Orcon my router was fully reset to factory settings however the problem is still persisting. 

Is this likely to be a router hardware issue? an Orcon connection/settings issue? or something else?

Any help would be appreciated. I would like to be 'armed' with at least some creditable info before contacting Orcon support (!) once more.
Their last advice would be to ring them if it happened again! Which of course it just has, outside of their support hours!

Thanks. :)