Maybe you will be able to help me.
I'm encouring a problem for the moment with my router C5400X. All was fine few weekds ago and since about 1 months, i've sometimes a long ping on the internet in Wifi connection (2.4 and 5 ghz)
Sometimes I have to wait up to 1 min for the page begin to load. I have not this problem with wired connection.
Sometimes, it works perfectly. Initially, i was thinking that it comes from wifi policy on my smartphone but all smartphones have this problems. In addition, voip call and instant messaging (like viber or messenger) does not work properly. Sometime (not every time but often), the call does not reach the smartphone connected to the router and message not too.
I try to deactivate security options, put the concerned device in high priority, try 2.4 and 5 ghz but still not working. There is between 20 and 25 devices connected to the router in the same time. I suppose it can assume this.
My speed is quite normal compared to what I supposed to have with my ISP. the ping with my wired device is like 10-15 ms. When i have this problem,the speed test fail because impossible te reach the server error.
There is no update available
Can you help me please.
PS : excuse me for my bad english, it is not my mother tongue.