It happens to me lately too. Probably a regression in wine. Try an older version, maybe 1.2 to see if it goes away. Myself I've been to lazy, and normally just exit and restart reaper
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Reaper for Linux Documentation (WIP). Software: Archlinux/KDE, Fabfilter FX, Komplete 8, Nebula, Schwa/Stillwell, T-racks Max/Amplitube/SVX, etc. Gear: i7-2600k/4700HQ/16GB, RME Multiface/Babyface, Behringer X32, Genelec 8040, etc. :)