Anything that can fail will definitely fail. This consequence of Murphy's Law is experienced by many Internet users every day, unsuccessfully trying to get the network up and running smoothly.
The first and not the worst idea that can come to mind when you have a problem with your Internet connection is to thoroughly scan your system for viruses. Quite often, seemingly harmless files, which even the titled programs cannot “probe” the first time, are malicious, recklessly disabling not only the network, but also other equally important system components. The way out is to check the computer as many times and with different programs. If everything is in order with viruses, more precisely, with the absence of those, you should check the network card. It is likely that it simply conflicts with other system devices, so much so that even when its configuration is updated, the situation does not change for the better. In this case, you will have to fork out to buy a new one, after consulting with experts first. It does not interfere with checking both the power supply and the motherboard. It is possible that they simply do not "pull" all the "hardware" with which the user greedy for high technologies has equipped the system unit. In such a situation, all that remains is either to change everything at once (in other words, to practically buy a new computer) or to get rid of the excesses. For example, from a super-sophisticated video card, only needed for designing a skyscraper in real time, a couple of gigabytes of RAM or at least one floppy drive. Another reason for network outages is processor overheating. You can cover the system unit with coolers both from the inside and from the outside, but this will not correct the situation if the computer has not been diagnosed, as they say, since its inception. So to restore the smooth operation of the network, it is sometimes enough to clean everything that is being cleaned and blow out everything that is blown. Well, if this did not help, then you will have to seriously think about replacing the processor, wasting away from working at too high speeds. Not the most effective, but also quite acceptable option is reinstalling the operating system. If the Internet worked like clockwork before installing the latest version, it makes sense to roll back all the changes and return the old OS, which is not essential for working with many modern programs. However, this can cause difficulties for laptop owners where the OS is already installed at the factory, seriously and for a long time. Contacting the provider's technical support and looking for the notorious gap, if there was one at all, is almost hopeless, although it is still worth trying if all else fails. It is possible that there really are some problems on the line (about which, of course, none of the service employees will be particularly concerned), which will soon be eliminated.