Installation has worked fine for 2 1/2 years with no changes in computers, phone, phone lines, type of Verizon service, anything else. Normal speeds, according to the Westell homepage, is 1792 / 448. Over the last 6 weeks, the download speed, but NOT the upload speed, drops to about 0 about once per day. Specifically, speeds, according to Westell homepage, drops to 32 / 448. Powering down the modem and bringing it back up restores normal speeds, but then, usually within 24 hours, down it goes again. Do I just need a new modem?