But it has only happened a few times for me. I have not created any github issues. I only have 1 friend on matrix so I don't get that many messages :)
But each time I open the app, the syncing is kinda slow, much slower than on the computer in my experience. Isn't it possible to enable fetching in the background?
hah, sorry - i was trying to find out what build of EX you were on, not Android :D
That said, from these symptoms, it really sounds like you are on an older build of the app - and probably using the old sliding sync proxy rather than native sync implementation which has now landed in Synapse. The new builds also fetch in the background (whenever you get a push).
Please upgrade, try again, and failing that, file bugs on github.com/element-hq/element-x-android!