Slow internet speeds

[Sympt]

The issue im having started around march this year, basically my internet speeds will randomly just drop by 70-100%. This happens on all my devices. When im playing games or watching streams, the game will do 2 things, either i would rubber band or my game would just disconnect me, same with watching stuff online, it will buffer, go into lower quality and then just stop, even when im just browsing the net, pages will load slow.

I have 1 pc connected wired to the router, the rest of the devices are wireless on 5ghz connection.

Things ive done,
- Reset modem/router
- ive been giving 3 new modems and routers from my isp since the issue has been happening.
- i had 5 techs come out to try to fix it, nothing happened.
- had the wires replaced
- got a new amp for my wires

I believe this issue started to happen after i got a new router due to my old one having a faulty power cord. but ive gotten 2 new modems and routers since so idk.

I did have a tech say it could be due to me only having 1 tv connected to a box, the rest are just connected to cable. but i doubt this is the issue

Can someone please give me anymore ideas or things to try to fix this issue please.

my dad tested the coax line thats being used to connect to the modem, this is what we got http://imgur.com/a/al01L i also ran a ping test to google for 100 pings. this is what i got https://pastebin.com/UtzzPRGm

heres some more info on my modem/router

modem: Aris
model: tm1602a

Router: sagemcom F@st 5260CV

 

[JackMDS]

The best idea is Not to through "Random Balls" but to isolate the real cause of the problem.

As an Example disconnect the TV system from the Network for few hour and see if the the "problem" disappears.

Or and, disconnect everything and leave only the Wired PC on the Modem. Idf the problem persist it might be an ISP issue. ISPs in 99% of the time would not admit that its their problem unless you show it directly with prove to their face.

Or and, find out if the problem is Only on the Wireless or all across the board. etc etc etc.