TWC has pretty aweseome “standard” speeds compared to other cable companies in other areas
Actually thinking of upgrading to wideband pretty soon… exspensive but well worth it IMO
As far as their service cutting out, I’d suggest calling them and asking them to check the lines running to your house, I had a similar issue a few years ago, some old ass coax wire mixed with the line outside having moisture in it made for some shitty times.
Also try replacing your modem, they do go shitty perodically it seems. Every couple of years it seems I have dropout issues that are fixed with a swapped out modem.