Just for anyone else out there suffering - I hit the same issue when I set mine to 32000 - supposedly the longest possible report.
I don't think that Fibaro are interpreting the setting correctly.
I found that setting them to 30000 worked OK - I think this may have something to do with the 2nd byte coming out at zero, but I don't care too much as it looks to be fixed now!
(I'm wondering whether this was the cause of my Z wave network being rubbish on ST, and forcing my move to Hubitat.... at least Hubitat has the debugging tools to let me find issues!!)