I have installed the hotfix but the problem remains, I'm in Johannesburg, Auckland Park.
I got the modem yesterday, initially I got great speeds, last night it didn't work at all. Today it switches from HSPA+ (with a max speed of 300KB/s according to my download manager) and WCDMA with no signal at all - it does this every 5-10 minutes. Also since installing this yesterday my PC has frozen five times all while downloading different things (it froze while I was writing this and just doing a windows update) and this is a complete freeze, even after waiting a few minutes I have to press the restart button.
I'm using Windows 7 64 bit and I've got McAffee (which I tried stopping and made no difference).