Onkyo NR708 volume control

Volume only goes up in half increments when pressing up or down (shows full increments on simple control screen but only half on receiver).

After a few seconds simple control gets feed back and then shows correct.

Using slider works correct.

I also have an NR616 and it works correct.

Setup using IP control as Onkyo All Models zone 1

Would be a good idea to contact support to make sure this is either some misconfiguration or fixed in V5.