I'm using Samsung S7 Edge (Android 6.0.1) with Slingplayer Free for Phone (build 2.0.4, ad free) on a Slingbox 350 (with 250/20 internet speed). It works perfectly when the phone is connected to wifi, however, streaming stops after approximately 90 seconds on cellular connection. Had exactly the same issue on Samsung S6 Edge+ as well. The cellular connection is excellent with 10+ Mbps (4G+).
Tried to reinstall, still same issue. Cellular limit usage to 1024 kbps is disabled