I wouldn't expect equipment to cause a sudden decrease in speed, at least not directly.
I have a suspicion they want you to upgrade, and are sort of "forcing" you to, by killing performance. Microsoft did this to us a while back with one of our SFTP servers. It was old, out of spec, MS wanted us off of it, so they started intermittently killing performance. They actually told us this when we called support, and gave us 90 unimpacted days to find a new solution.
I think they do it with Windows updates too. I'll ignore updates for a month or two and start seeing strange behavior. Restart without update doesn't fix it, but updating fixes it. It's dirty, unethical, and seems like it should be illegal but I've never read their EULA so probably something I've agreed to.
As far as what you can do? Ask the provider what models of router you're able to use, and buy your own. It usually pays for itself within two years, vs. the monthly lease.
I'm pretty much stuck with provider supplied modem/router/wifi because they provide my land line phone too. The phone modem is part of it.
You need a land line?
Yes, I was tethered to pagers, cellphones, desk phones, voice mail, email, etc the last 15 years of my career. That got old fast. I swore off cell phones after I quit work. A land line is really all I need if someone wants to contact me. I have a texting app on my kindle so texting is covered. If I go on a trip with friends, someone always has a cell phone if I ever need it. Cell reception sucks in my area, hills and moutains create a lot of dead spots and dropped calls. F#ck it, I don't need the aggravation and find little added value in the added monthly expense.
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