i am not a motorola rep so i am not positive on the error codes but what it looks like it when your isp changes you IP address, looks like you are dyanmic, you are having connection problems..
It also looks like you ISP isnt using all of the field that the modem is looking for..
When the SW Upgrade Failed Before Download - Server not Present ... dont worry about that because the modem is getting it a different way.. I dont know why it your connection is having speed problems..