Problem with RFLink time outs

[Robin20VT]

Hello all,

I've always had an Rpi1 with RFLink USB hooked up. My buddy gave me an Rpi3 for my birthday but I'm having some setup problems.

The RFLink + Rpi1 always worked 100% fine, but with my Rpi3 the story is different. I've got an fresh install of Jessie Lite with all updates applied and a RFLink USB with the latest firmware available.

I just installed the whole bunch again and when adding my KAKU (Eurodomest) switches the first 2 will add fine, but after switching them on and off a couple of times it suddenly stops working. When looking at the log it says:

2017-02-14 21:04:58.027 User: Admin initiated a switch command (1/Aanrecht/On)
2017-02-14 21:04:58.028 RFLink Sending: 10;Eurodomest;0d2ac9;2;ON
2017-02-14 21:05:03.000 Error: RFLink: TX time out...

Anyone got any idea? The only thing I haven't sorted out is my MicroSD card, I think its a class 4 but that can not be the issue right?

Thanks in advance!