Poor, inconsistent speeds
After a couple months of somewhat stable service, I have begun experiencing poor and inconsistent speeds. Last night I measured 48 down and 9 up. I was told conflicting information by chat, one telling me there were network performance issues and the other telling me there were no issues. They suggested I did a bunch of different things. I connected to the modem and got decent download speeds. By time I connected back to the router and rebooted, the speeds were as expected.
An hour later, I tested good speeds still 500+ up and 100+ down. This morning I tested 500+ and 100+ again. I started seeing problems later in this morning and ran another test and got 200+ down and 89 up. I tested once again and got 500+ up and 100+ down.
I have rebooted the modem, router and ethernet connected PC multiple times with no change to the speed tests.
Thanks in advance for any help.