Really bad service new iphone 13 pro Tmobile

I perviously had an iPhone 11 pro max LTE and the phone was great. I got the new iPhone 13 pro max in September and I have been having so many signal strength issues from day one. Talk is fine, text is intermittently glitchy. Sometimes texts go through, other times not. The biggest problem is data. Initially, the phone was great, but then about 2-3 weeks into using it, the internet went out. I couldn't use anything on my phone that required the internet unless I was on WiFi. I called T-Mobile like 8-10 for tech help. They determined the phone was defective. I had to go through Apple to get a new phone, which was such a hassle since the phone was only like 5 weeks old. I got another phone and the same thing... It's a bit better now. It's like the phone gets confused or something. All of a sudden out of nowhere the phone stops getting data signals. Then I get one bar 5g or no bars, or 3 bars LTE. No internet. When I'm in the house I have to use WiFi. I have even stopped using my phone in the house and use my iPad- my 6 year old iPad works better than my iPhone 13 pro max!!! I have found when I'm out of the house the way to correct the issue is by reseting network settings. That will work for awhile. But the problem with that is I have to rest like 10 times a day- I'm not exaggerating here either. And then when I go home I have to plug in my wifi password again. I cannot believe that my old 11 pro max was a better operating phone than the 13 pro max. I cannot believe that Apple is putting out such crap for the incredible amount of money they charge for their phones (and everything else). So disappointed in Apple- I am a loyal Apple consumer... They need to get it together... this is not a T-mobile service issue, this is an Apple issue!