I am using OH2 v2.5.12 which runs fine with several bindings. One of them is the Homematic binding, where I run a handful of Homematic as well as Homematic IP devices (Remotes and Smoke Detectors).
Everything works fine, but the HmIP-RC8 stops working after some time. I can see in the log that key-press events are not even shown in the eventlog. The device is shown as connected.
I tried removing and re-adding the device, rebooting OH, changing batteries but only removing and reinstalling the binding brings it back to life for some time. Usually over night it starts to fail again.
My HM-RC-4-3 in comparison never has that problem. It just works.
Looking at the Raspberrymatic the RC8 works as well. Even when trying to use iobroker the RC8 never has that problem.
So in the end I would guess that it is the binding. I found some older posts (referring to OH 2.2 and 2.3) that reported some similar problems. Anyone else experiencing similar behaviour?