You have a noise ingress problem around 300 MHz (downstream channels 12 & 13), causing poor SNR on those and some surrounding channels. The source of that is probably military communications, but it will be coming into the network through a faulty joint, damaged cable maybe even an unterminated coax cable. Check that your coax lead to the hub is securely fitted and the securing nut is finger tight, unless that works wonders then you'll probably need a technician booking to come and sort it out. I'll flag your post for staff to advise.
Edit: The staff will probably want the hub running in router mode as they can't interrogate the hub status in modem mode. If you need to do that, might be expedient to have the hub in router mode and the Draytek in access point mode (if it's the wifi model) until the VM connection issue is fixed.