Samsung Galaxy Android Marshmallow Problems
We'd expect the Samsung Galaxy Marshmallow updates to bring problems to Galaxy smartphone and tablet users. Software is never perfect.
Samsung's Galaxy S6 Marshmallow beta will go a long way towards eliminating some of the most annoying and glaring bugs and problems on board the new operating system though it won't catch them all.
Bugs always slip through the cracks. Just look at Apple's current version of iOS 9, iOS 9.2, an update that went through a lengthy beta process before it was pushed out to the public.
There's no way to predict what you might see on your device so the only thing you can do is be ready once the software prompt pops up.