Thanks, guys!
@sonic1: No, I don't have crossepg as plugin, so I guess we can exclude this as an option.
@WanWizard: Thank you so much for the description. My time and date are usually working well and they just need a few seconds to update when I restart my box. So I guess this is not the reason. Actually, I haven't flashed my box for about a year and have just used the incremental update in the mean time. I'll therefore set the autobackup and flash the box using the newest version of software. Is the OpenPLi-4.0-beta-vuduo2-20151019_usb.zip stable enough?
Thank you!