said by Dude111:
But if the signal level COMING IN FROM THE ISP gets too low,THE MODEM/ROUTER will transmit STRONGER and they cant handle it and lock up...... (I think thats why they lock up)
Ummm, you're confusing 2 different signals.
1st signal is downstream. Transmitted by the cable company CMTS and RECEIVED by your modem.
2nd signal is upstream. TRANSMITTED by the MODEM and received by your cable company's CMTS.
If both of those signals are off in the way you say (receive is low and transmit is high at the modem) 95% of the time your modem is not connected to the first 2-way splitter in your home.
Again, post your modem levels.--
If it's important, back it up... twice. Even 99.999% availability isn't enough sometimes.