The situation is the following we have not stable working Cisco RVS 4000 in a small network with no vlans assigned in it and only two serving subnets statically assigned so no DHCPs. Everything is powered by two separate connections from one ISP. the one is for the Cisco and its subnet and the second is routed by Mikrotik serving the other subnet. Everything is using one physical network with no VLANs. Is it possible the problem to be rooted in this share network and coexistance matter. With cheap router instead of this cisco everything is partially OK(connection dropping), but we use it because for the ACLs assigned for one of these subnets. Only one managed switch is used 3com Smartstack 3226, which is the main one with default config, after that no managed switches are used. Both routers are up to date with firmwares.
The mikrotik connection is working perfectly, the other subnet which is surved by This Cisco and also previously used Tp-link, etc. have problems with connection(dropping connection, ping, requests etc.) The ISP also uses Mikrotiks for their all city network. I don't know what is going on with this Cisco and the second subnet. No cable management problem, The config for the Cisco is OK nothing special static WAN IP and also static LAN IP some ACLs. ALL blocking services are off the problem still exists. Also IPS is off which caused Windows 7 connectivity problems.