Hi sos, I don't think I've heard of that problem before.

It's most likely a Wine issue, I see some similar Wine bug reports like this:
https://bugs.winehq.org/show_bug.cgi?id=57438

You might try setting the UseTakeFocus flag in Wine, under the == WORK-AROUND == in that bug report.

It's also mentioned here:
https://askubuntu.com/questions/299286/how-to-recover-focus-after-losing-it-while-using-wine

Or also if there is a newer version of Wine try using that.

- Michael