Thanks. This is modem https://www.amazon.com/dp/B00AJHDZSI?ref=ppx_pop_mob_ap_share and this is router https://www.amazon.com/dp/B00FB45SI4?ref=ppx_pop_mob_ap_share.Mesh probably solves your issue.
If your router/modem came new 5 years ago, then you shouldn't be impacted by that equipment. However, the DOCSIS standard changed around 2010, and if your modem doesn't support DOCSIS 3.0, you need to get a new one.