Will only be affected if the backup power of the towers near you fail, or start stepping down power output.
In our area RAIN died along with other ISPs that piggyback on the same towers. So again its the lack of investment in standby power (because this is Africa) that is the Achilles heel of the technology.
So after doing a factory reset on my router and changing a ton of settings, I isolated my problem. It turns out my external antenna (Both) are faulty. Not sure how both popped but now I have good speeds from Rain on the 2300mhz band.
I'm on the cusp of coverage area...earlier in the year I was getting awful DL speeds and consistently < 0.1Mbps ULs and had been for a while and all but given up with RAIN...see my earlier post on this thread.