I've had issues with a WR21 router for the last couple of months. It sometimes looses connection for several hours. I have an older Sarian router on the same site and that one seems to work better so i doubt it's a network issue.
When I got the WR21 it was quiet new and the firmware had a bug so I had to change the modem to PPP instead of NDIS to be able to manage it through SMS (support case 00135602).
That issue was later fixed and on following routers it's been working fine.
The first router has been running the original firmware until now but since I'm having issues last months I upgraded it to the latest one.
It seems it didn't help and it still looses connection from time to time.
Would it be a good thing to change it back to NDIS driver? How do I do that?