My fios 50/25
Only early in the morning, the internet speed is usable.
The rest of the day, the internet speed is unstable.
After dusk, i can't send emails with attached files like an image file.
The connection is lost.
I tested my internet speed as shown below.
When I tested my internet speed from verizon, lot of time there was an error message that said 'test timed out'.
I tried all the different servers.
Sometimes the test is an success but the speed is very slow.
I installed the optimizer tool and did all the other options like resetting the router, checking the wire, etc.
I used the internet for over 15 years but I can't solve this problem myself.