The errors you posted are hardware & or drivers & they tend towards networking & connectivity issues so the modem is suspect as was pointed out to you in the first error.

Here is another driver brought up from netmotcm.sys
Altho it is a few years old.

http://www.modem-drivers.com/drivers/77/77622.htm

If you turned off the automatic reboot & can copy the error screen that would be helpfull. Also do a search from start/search/.dmp
Do you have any recent .dmp files?