Constant high ping/latency on PS5 using ethernet and WIFI

As title says. I am experiencing high ping/latency on all games on ps5. I have the xb8 modem and the 2Gig plan. I have TP Link Deco mesh acting as a router connected to the Xfinity modem via Ethernet and have bridge mode on and checked with their support team and everything is good from their end. Issue happens regardless if I am connected via Ethernet or WIFI. Tried all troubleshooting and nothing worked! Had bridge mode on and off didn’t work! Replaced all cables nothing worked! Had 3 technicians come to my house and changed the underground line, the coaxial cable and modem. It worked for a couple of weeks than the same problem is happening again!