Maybe it could be caused by the low amount of storage space in his phone or the age of the phone used. I mean, woodcutting has been working well for quite some time, it couldn't suddenly gone wrong and affect only one phone by now. :/
Wrong. I used to cut wood on my iPhone 6, as I started playing OL west again actively not too long after I got it... It's a game issue, not device. As I've had it in my iPad as well
happens to me also on iphone 6+
when my friend cuts trees the crashing keeps messing up his macro and he keeps having to reclick the play button every hour making it a super annoying bug for him also