Netgear C7000V2 issues with Spectrum interest

I am a Spectrum Roadrunner client using a Netgear C7000V2 modem router.  I have had issues with access dropping multiple times a day.  We have had numerous visits from Spectrum technicians to investigate the issue and while they have made some changes, including closing a loose connection at the cable post, nothing has corrected the problem.  The last technician indicated that the issue was a problem specifically with Netgear units.   

Has this issue been reported before and is there something that can be done to fix it without buying a new modem router?