Hi I'd suggest disabling the ability to arrange friendlies until you can arrange what time they are on.
I normally arrange friendlies on my pc but this morning after my league match went to arrange one on my android phone. It arranged the match for 3 minutes from the time I clicked "arrange friendly". When I saw that I couldn't arrange the time I went to cancel the match, but couldn't because it said I couldn't cancel the match when it was so close (3 minutes away).
So I had to play the match, which tired my players alot but more importantly the friend I was arranging the match against had a cup match in a few hours. I was planning to arrange the friendly for later tonight which is what i can do on the desktop version.
Thanks.