Android nRF Connect app DFU is flakey on my phone, a Motorola Droid Turbo w/Android 6.0.1. I tried with a Moto X and it worked fine, but on my Droid it rarely downloads successfully. Looking at the nRFConnect logs, everything is the same as with the Moto X until it connects to the nordic bootloader (my app goes to the bootloader, bootloader sends advertising, phone connects and gets all the attributes, all OK), then on the Moto X I see that it negotiates an ATT_MTU of 23 bytes, while on the Droid it doesn't do anything. The Moto X then proceeds to download while the Droid hangs until the bootloader times out. I'm using the unbonded download. I have the log level on verbose. Seems that the nRFConnect is getting stuck on the Droid. How do I debug that?