You can upgrade to any tomato version but simply tick the 'erase nvram settings after flash', it will prevent any conflict, later fix your settings manually from scratch. When you talk about connection lost... do you lost public IP in your router status gui?. I'll release v1.2y release this week, there are many changes... some of them need test (so... if your router is in production be careful when upgrade to 1.2y version, I have tested for 3 weeks and it's amazing but I'm using standard configuration without scripts), then, since I didn't read bugs in 1.2x (besides QoS), is there any other bug in 1.2x version?. Doing ping in your LAN doesn't affect at all. Thanks!