Question Fiber optic network service. Frequent disconnection. Upload ping 4000+, download ping fine. What could be the cause?

[Danish_Nazir]

So i have a fiber optic network service 20 mb connection. Everything has been fine for years but now i am facing frequent disconnection and low quality Internet randomly throughout the day. When I check my speedtest Upload ping is 4000+, download ping fine.
No packet loss. But Internet is down for a 1 minute and back up again 5- 10 times a day.

I have contacted the customer service but they say that their system is showing optimal line service.
I tested speedtest with only one device connected in isolated manner to check if it is a bandwidth problem. Upload ping is still high when only on device is connected.

I had it for 3 weeks. Customer service just denies the problem exist because their end is clear.

What could be the causes for such high upload ping?

https://imgur.com/a/zDEQwgm

 

[hedwar2011]

Your upload speed is always going to be slower than your download speed unless your ISP offers you a package that has specifics. That's usually the only case where they would get close to each other. Make sure you don't have anything close to your modem/router, etc. to prevent any environmental issues from coming into play as well.