DPC3825 WiFI Signal Becomes Unstable

I have a Cisco DPC3825 DOCSIS 3.0 Wireless Modem.

Firmware version dpc3825-v302r125573-131008a-COX 

Firmware Build Time Oct 8 10:55:58 2013

Every 2-3 weeks my devices tell me the wireless signal is unstable. Resetting the device helps but a few weeks later the wireless signal becomes unstable again. 

I need the firmware either updated or re-flashed if the build I posted is the latest one. Can it be done through here without me having to call in and deal with tech support?