Why is the Internet dropping over LAN and WIFI?

Question

Computer networks

Every day the Internet drops 2-5 times per hour (very rarely it happens only 1 time). Periodicity or connection is absolutely not captured, it happens at very different times and in a different manner (3-10 seconds of such a drop).
This problem is observed on all devices - smartphones, laptops, PCs.
Connecting only via LAN or only via WIFI, or both, does not change the situation.
First of all, we changed the router, it did not help; changed the cable, did not help;
checked all the settings of the network, router and 0 sense.
From the provider's side, everything is smooth (if you take a word), they also checked the cable, they said that everything was fine there.
All LEDs shine as they should (both on the PC and on the router), there are no errors in the logs, in general, there are no traces of the incident, except for the very fact of the drop.
All drivers, firmware, settings have already been rechecked several times.
In the windows taskbar, the "Internet Access" indicator does not change, and remains so.

Answer 1

there are about a dozen reasons, it is
necessary to treat with a diagnosis and logs, and not a placebo
99% it's in the provider, try to fix it

Answer 2

they also checked the cable

- I doubt.

there are no errors in the logs

- I also doubt it.
Cables are checked by linemen, they are fitters. On the first call, they always hope for a chance. In the basement, or in the attic, where the switch is located, they most likely did not climb, even if they checked in the entrance.
And at 2 ltp, who looks at the logs and diagnoses diagnostics, usually highly competent people are not imprisoned. There may be errors, just the networker who watched them, if he looked again, he did not see them. I am not speaking out of nowhere. In two providers worked, in both situations were similar. Fitters are lazy, 2ltp employees are incompetent to solve difficult situations. And your situation is from the category - "it's not clear why, but for some reason it doesn't work", that is, from the category obviously, not simple situations. I can safely say that the problem is on the provider's side. There is only one solution, call, call, call, call, if it doesn’t help, write complaints. 2-3 calls and the installers will definitely inspect the entire cable. An engineer with a signal analyzer will arrive on the fourth. Then they will start demanding more competent colleagues to look at the logs.
I myself have been in such a situation, a private house - every 2-3 hours a drop of a DSL signal begins. Fitters came, measured the line - it was useless. And only when I already got them, the cable team arrived and replaced the cable box that they used to go to, but they didn’t pay attention that it was all rotten. Solved the problem - 8 months.

Answer 3

The situation was with optics, I noticed an acceptable bend in the entrance, corrected everything with my own hands, everything began to work perfectly.
Outcome: Torture those provider support, obviously there is a problem.

Answer 4

Hello.
The problem from your description is in the line.
The simplest and most obvious solution. Together with those support on the call, connect the cable directly (if possible) and start speedtest. With a load on the line and the presence of damage, there should be an increase in CRC errors. This should be watched by a technical support specialist in real time. Or see the port drops that are possible in the test.
Based on this, the switch port changes, the line is checked, and a pull is made.
There is also a possibility that your utp cable line is more than 100 meters, so the signal attenuates at full duplex and load, and drops from there.
All this can and should be looked at by a technical support specialist.
You have to be persistent.
Write a letter taking the recommendations from the habr that we described and request this data:
Are there any errors on the port? What happened to my requests? Are there any drops at the specified time in the switch logs? What solution can you suggest while keeping the cable problem straight?
When the problem is solved on the basis of this, you can demand recalculation / compensation, etc. due to incompetence. support those.