I hope next update will fix this issue or what else can I do?
As long as you have the seed you'll be free to take the seed and try another wallet if the update or reinstalling Mycelium doesn't work.
The only issues I've had with it after several years of use are their servers going down, which affects everyone but has only happened a couple of times, and occasionally I've had to reload the account when new transactions didn't show up.
It sounds like it's crashing on you which has never occurred for me.