I experienced the same thing...had to uninstall the Masterbuilt Bluetooth on my iPad and reinstall it. Now I can report that they did improve the Bluetooth and it now can be monitored from inside my house. The prior Bluetooth operation had very limited range, and in-sight only, like 30-40 feet. Not only that, when I called Masterbuilt they promptly answered my call and politely walked me through the Bluetooth operation. Almost like a different company.
I purchased my 40 in 2.5 MES from Bass Pro in April, so those who recently purchased one may not even realize the improvement in the Bluetooth format.