Hi, 

I have huge issues with Carrier Aggregation with the MR 600 Router. Both V2 and V3 are not working as expected although they both show different failures. 

V2: loses Carrier Aggregation randomly. Can happen after 2 Minutes, can happen after 5 hours or only once a day. 
V3: cannot establish Carrier Aggregation at all. 

Both are tested on the same spot using the same SIM card from a Virtual Mobile Network Operator in Austria (bob). To make sure, it's not related to the network or the SIM, I tested the connection with a Huawei LTE Cube and as well with a TP-Link Deco X50-4G. Both work flawlessly over several days w/o dropping the Carrier Aggregation. 

Once the MR600 V2 is losing the Carrier Aggregation, it can be immediately re-established once the device is rebooted, while the V3 cannot establish the Carrier Aggregation at all. When 4G+ is established on the V2, I can get the full promised LTE speeds until the CA is dropping again. The Bands used are 3 and 20. It does not make any difference, if the bands are selected manually or the router is selecting them automatically. 

Based on above findings, I assume a bug that hopefully can be fixed soon. At the moment, the devices are both unrealiable while the V3 cannot be used at all. The Deco, that fixes the CA issue, has unfortunately a lot of features missing to replace the MR600 or satisfy my needs. So this is no option either. :-( 

I can share additional data and logs if needed for both V2 and V3 devices. 

Thanks for checking and getting back. 

Philipp