I have a Mikrotik router model RB751U receiving directly from ISP- feeds 3 Cisco Switches of 24 port each then to Patch panels and to users. I am having internet ups and downs in this way: When i bypass my LAN and log into the router to ping 8.8.8.8 i get clean pings showing there is internet in my router yet myself connected directly to the router all any user on LAN can't browse. Usually the drops happen different times but with an a.v of 5 every day taking less than 2 minutes and the internet comes up again.
What are the possible causes on this problem???