2016 or 2017 model? The 2016 model does have some know issues. It is listed as an unsupported device. See Trimble Catalyst | Compatible Devices.
As you may know, there ware two different modes in which you can operate the DA1. DA1 as the Host or the Phone as the Host. To operate DA1 as the Host, power up the DA1 using an external battery before connecting the DA1 to your phone. To operate DA1 with the phone being the Host, connect the DA1 to the phone first before connecting the battery (optional).
Some phones work better in one mode. It can be worth trying both modes to see which works best for your phone.
If the issue persist in both modes, it can likely be due to 1) faulty USB connector, 2) damaged phone USB port, 3) phone compatibility issue