There are several reasons.
1. Too many terminal devices. For example, the device in your home is a WIFI device of about 100 yuan, and the number of computers, mobile phones, and ipads connected to it exceeds 10. At this time, you can obviously feel the card, which is often shown as connecting to WIFI but very slow, and occasionally fast. The solution is to change the router, it is recommended to support AC devices
2, the nearby WIFI signal is too much, the same frequency interference is serious. Many nearby homes are open WIFI, mobile phones can see more than a dozen, this time if it is 2.4G wireless router, how will be interfered. The solution is to use the scanning function of PingTools to see if it is really a lot of signals, a lot of words for a 5G wireless router.
3. The router Settings are incorrect. For example, 802.11a\/b\/n, you drive to a or b mode. However, this is unlikely, and the default Settings of the general router will be selected by itself.
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Label your router model, the area of the home covered, the number of devices, the nearby WIFI environment, download the speed measurement software, this information can help you further diagnosis.
Graphics card problems: The above problems are generally caused by poor characteristics of the graphics card master chip, or not close contact with the graphics card slot, or too much dust in the graphics card slot.
We can disassemble the mainframe, find the graphics card, pull it out, clean the slot, and reinsert it