To handle this problem, I have done this:
1. Default router.
2. Install v1.34NA firmware.
3. Configure for 300Mps (see sticky).
4. Turn off Daylight Savings, set time manually.
5. Turn off SecureSpot.
I was complainging that v1.34 was still losing internet, but, I forgot to disable SecureSpot.
I did that last Friday.
So far no downtime noticed, even with high usage this weeked.
I hope this helps.