Signal levels below acceptable ranges

I'm experiencing daily internet drops, purchased a new SB8200 in hopes to improve speeds & minimize drops but no such luck. After 2 hrs on phone with Arris tech support, bonded channels are below acceptable ranges of (45-55) dbmv. I shared the lowest and maximum levels with Cox phone rep but doesn't seem like he can do any other than reboot the modem. Another service tech is coming out tomorrow will he be able to diagnose the cause of signal levels?