When Synscan becomes background, the WiFi times out after 15 minutes and connections drop (with apps other than SkySafari too). Workaround for newer tablets (phones) that do not have a "keep open" option, and just have the single swipe bar at the bottom (not the three buttons): Use SkySafari/Synscan in split-screen mode (I had to find a YouTube tutorial to show me how to do that). Drag the thin bar at the bottom half way up - this puts you in recent apps mode. Click on the title bar of say the Synscan app and hold, choose split screen - you can then drag its "window" to about 1/3 from the top. Then choose SkySafari and it will take the lower 2/3. When I go to an observation and click on the mic for voice-to-text, the app expands to more screen real estate, but then pops back to the lower 2/3. Ran a mount for more than 2h this afternoon, no disconnections!
Note that the above may be obvious to expert tablet users, but it wasn't to me, a relative tablet newb.