It seems we have both? 2.4 and 5 GHZ. Also, it only happens during the day. Around midnight it is working just fine. Another thing is, our former wifi is still active. Could that cost problems?

I already did. Last night when I turned the firewall off, it seems that it fixed the problem but it's been the same today :(

Hi guys. I got a problem with my wifi whereas when I do ping google.com -t, I am having long queues of:
(like every few minutes)

Request time out
Request time out
General failure
General...