It disconnects sometimes when I'm playing on wifi multiplayer

Can you test this with some other multiplayer app and see if you get the same problem? It might just be a bad connection.

He has a point

Can't confirm on android! (I was playing with my friend and never got disconnected)

Mod, please update affected versions to include 0.8.1

FWIW, MCPE-6713 indicates Android-hosted worlds creates instability for iPhone guest players. Did not think to test the reverse (iPhone-hosted with Android guest). That issue description contains other details regarding signal strength and distance which appear to negate the concerns of a bad connection. Both phones are top-end handsets, as well, so client hardware/OS version limitations are not a likely cause either.

If you switch apps on iOS or have a unstable wifi network, Minecraft: PE will disconnect

It disconnects me almost every time then it doesn't show on friends list