[Samsung Galaxy Tab A series Questions & Answers] TurbineTester:
I purchased 4 new Galaxy SM-T580 tablets (Amazon $165/ea)for four kids ages 6-11.* Installed Minecraft from Google Play store from Purchase of Minecraft (PE Edition at the time) made on 12/24/2015 for $6.99 (I have the email receipt).* I also purchased Minecraft from the Apple store around the same time.* At the time i was under the impression that one purchase on Google Play or Apple should cover 5 devices on each ecosystem.* Minecraft was then installed on several Android and Apple devices with multiple players being able to log in and play cooperatively on LeapPads (side loaded via Amazon Marketplace), older Galaxy Tabs, Android Phones, 2 iPads, and 1 iPhone etc. There were no issues with disconnections that i can recall.

I have uninstalled Minecraft from the older android tablets and the only android devices with minecraft are these 4 new Galaxy tablets.* All 4 children can play Minecraft on individual worlds on their own device with little to no issue.* However, when multiple children try to join with one child's world as visible on the LAN under the "Friends" very shortly they get a message that they are Disconnected from the server, and then that world is no longer visible on the "Friend" list.* A couple of times this has actually managed to disable (as in turn it "off" in the android settings) the wifi on the host Android device.* All four children's devices are logged into a single parent google account on the google play store (otherwise they wouldn't have been able to download the game without paying again i suppose). My wifi access point is a Ubiquiti AC-PRO and a Ubiquiti EdgerouterX and has excellent performance in the room in which the children have attemtped to to play cooperatively.* When I log in to the Ubiquiti Unifi app to view the AP status from a laptop, and monitor all the eye candy available I can literally watch the host tablet device go from perfect connection (Wifi Experience 100%) to essentially zero, after the 3 other tablets connect to it for about 2-3 minutes. It's almost like the outgoing wifi radio on the tablet itself is getting overloaded.*To eliminate the possibility that it had something to to with the Ubiquiti AC-Pro AP i removed it and switched to a TP-link wireless AP and the issue persisted.

To test various prior scenarios I hosted a minecraft game on two separate tests each on Apple devices (one iPhone 6s+ and one iPad3) and all four Android tablets connect and play flawlessly to that iOS hosted game for more than 5 minutes at a time. Once i switched back to one of the new SM-T580 devices hosting the game within 2-3 minutes the host device would disconnect all three other devices from the "server" and then none of those three devices could see the 4th host device under the friends list for about 3 minutes (possibly radio cool down or something??). I have tried hosting a game from each of the four Android tablets with similar or indentical server disconnect issues. The disconnects only happen when one of the SM-T580 devices hosts. Two of the tablets run Android 6.0 and two run 7.0. All are rooted with TWRP and Magisk, but running completely vanilla stock ROMs.

I have only been able to produce this issue by allowing other devices to connect to a Minecraft world on the LAN. If there are other diagnostics that could be used to "load" the wifi radio please let me know.

Could i have done something in the root process that limits the wifi performance? Is there a wifi performance setting I need to enable? Is there a known SM-T580 wifi radio issue? If so would updating to a newer Android version help this issue? Any radio firmware updates available? Anything else i should focus on for troubleshooting?

Thank each of you in advance for any help you may be able to offer. I really appreciate it.