If users report a problem, first check the list of Known problems of MDA Client for Android.
If the problems seems to be new, divide it: Verify if the problems exists at all.
Also take a note when the problem occurred (ideally when the user had it and when you reproduced it), so you can reduce the amount of log data you have to analyze.
Once it's sure there is a problem, narrow it down. Never ever forget about basics like cables, network connectivity, DHCP servers, DNS, and especially firewalls and proxies.
Once it seems clear where the problem lies, read the log files. Carefully. Twice. Again.
The MDA Android Client logs to Android's embedded logging systems, i.e. it log information can be retrieved using adb logcat.