I am having a strange issue with my MR600. I get a good download (45 Mbps), but my upload is 0.90 Mbps. Any advice? 

if I use the Vodacom router supplied by my isp (Vodacom) I get 15 down and 10 up so there is no issue with the provider or SIM card

this also happens on the Vodacom router but only when I enable carrier aggregation, the MR600 does it with or without aggrigation