After experimenting a week I found the following about good connectivity.
1) Dual band mobile devices connect better than single band, IF the mobile device is connected in the 5 Ghz band. Conclusion: Get dual band mobile device and connect at 5 Ghz, connect cameras (mine have no choice) at lower band (2 Ghz).
2) Using a two WIFI setup ( basically having an access point) is better than a single wifi. If all cameras are on access router and your mobile is connected to main router, the connection will be more reliable.
3) The more connected mobile devices viewing live camera feeds, the higher the chance of being disconnected. DCam-View on PC also is degraded if a mobile device is using DCam View, mydlink, just connect+.
4) I guess we all know this, wired is better than wireless.