Hi, same problem. Using nc450 v2 cam for a few months and started disconnecting wifi every few days or so. Only replugging power source help. This is a serious problem as it occurs every few days and device cant be reachable unless physically powered off/on. Noticed that while it's disconnected from wifi, it is actually running and recording but without wifi connection notifications/alarms doesnt deliver and device cant be controlled from outside at all.

Device is on latest firmware. It might be a software bug and can be solved with a firmware. At least devs can implement a solution so that device periodically check wifi connection and if it's disconnected, it can try connecting again or restart wifi module. Appreciate support from Tplink.