FWIW, that time is within their window for cable plant / network maintenance opportunities. That said, let's take a look at your RF signal status figures to see if they are in spec or are marginal (a very common cause of connection problems with cable systems).
Try getting them here http://192.168.100.1 or here http://10.0.0.1
Please post the *Downstream Power Level*, the *Upstream Power Level*, and the *SNR* (Signal to Noise Ratio) numbers.
What is the exact make and model number of the modem ?