I've used ET-732s for years. The only failure I experienced in that time was due to operator error (I sold, rented and built, moving twice in 1 year). I left the batteries in, and suffered the expected total loss when the batteries puked their guts. My bad.
The one thing I'll add re the probes is that they need to be FULLY seated in the transmitter. The first few times you use it, it may feel like they're all the way in, but give a good, firm push to make sure. [I had some intermittent issues with the replacement ET-732s I bought, and then remembered my own advice.
Since this thread is about the ET-732, I won't mention that my new Tappecue shipped yesterday.
Aside from the WiFi connectivity and the Android app, I like the 4-probe configuration. Perfect for my YS-640 (I have 2 probe ports on it; each one handles two probes easily; 1 for right-side grate temp and 3 for meat).
Like I said, I won't mention it.