Recent/open app list not showing

Hello, I am happy owner of 1+3 (coming from Xperia U) and I am very happy with this phone, no bugs at all except for this. Normally it works perfect but after maybe a day of usage without restarting phone, recent apps (or open apps) tab not showing any open apps but its definitely graphic bug only because all apps that I open again are normally loaded from memory. After restarting phone it works, even all opened apps before restart are showed. Oxygen OS 3.2.2. See screenshot before and after restart.
before reboot h ttp://i.imgur.com/KMOruMN.jpg
after reboot h ttp://i.imgur.com/hLkUn8S.png
Sorry for links, this is my first post...

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