I have a S+RJ10 in a CCR1036-8G-2S+ it is linking to a 2.5G metro link. The metro link registers 2.5G on the Ethernet port but the CCR says 10G under interface and status. Traffic is also sporadic and acts like there is a duplex mismatch.
Response from support
Hello,
You should enable Rx Flow Control on SFP+ ports where S+RJ10 modules are inserted to prevent packet overflow because on the host side CCR1036 and S+RJ10 establishes 10G link but the module itself can also negotiate lower link speeds as 5G, 2.5G, 1G, 100M, 10M.
I will test and see if that fixes it.