I use the Nvidia Shield K1 Tablet and Litchi hasn't crashed since I got it. I use it exclusively to fly as I lost confidence in the Go app when I was using my Samsung Note 4 as it crashed regularly but the Shield has been rock solid right out of the box. I didn't change anything on the Shield and have about 10 other apps I've downloaded plus Litchi and Go. I also leave the WiFi turned on as it doesn't seem to bother it. My shield doesn't even get hot on the back like the Note 4 did.I love Litchi - used v2.5.1 last weekend for over an hour non-stop without incident on my Samsung Galaxy Tab S 8.4 running Android 5.0.2... I also love that it can auto choose from all 32 channels without the hack... only had problems (and with DJI GO) on Nexus 7 (2012) and Rotor 10" (off brand tablet)...
Yes, ive been in the same boat today. Eventually I decided to throw in the towel and have downgraded back to lollipop. Anyone with Nexus 2013, don't be tempted with the Marshmallow upgrade, it will become flaky.