@Maxwell 

That might be an indication of something else.  While the router may have issues its always best to start at the source and work back.  What i would suggest is logging into your modem and getting its logs.  For cable modems the address is typically 192.168.100.1.  You may need to obtian the log in credentials for the modem either from your ISP or online from the device manufacturer.  If its a TP-Link modem the username and password are both "admin" by default.  Once logged in look at the logs for any T3 or T4 Timeouts.  These indicate a service level issue which typically requires a maintenance dispatch.  If there are no T3 or T4 time outs next look at the Channels.  You will want to make sure your downstream channel power level is between -12 and +12 dBm on each channel.  Anthing outside this will require the ISP to make some changes to your service, most require a dispatch to your home.  Lastly the SNR on the Downstream should be mid 30s to 50 again if there is an issue the ISP will need to fix it.   Upstream is never much of an issue so nothing there to really worry about. 

If the modem checks out then we would want to look at the router.  The first step for that is to do a Firmware update if available.  and if not then we would need to dig deaper into troubleshooting.  Please let us know if that needs to take place. 

@Ayufrida07 

I see you are located outside of the U.S.  This particualr community is only for customers in the U.S and Canada.   We do have a community for other users though at https://community.tp-link.com/en.  Please resubmit your question there and the team that are experts in your region will assist you. 

Thank you 

@Kemonie01000000 

Sorry I was out due to the 4th of July holiday.  Were you able to resolve this issue?  If not please provide me with more information so i can assist.