I have checked your dump reports, but do not really have the experience to know what is going on for sure. It seems you have a driver from 2008 which might be related to a Motorola Modem, smserial.sys (2008). If you are still using the modem, you might check for a new driver. If you are not using the device, you will need to keep it from starting on your system.
Because the driver is old, does not necessarily mean it is causing the problems, but is a possibility.
Someone with more experience will need to look at your other info to see if anything looks abnormal. But you seem to have quite a few drivers so I would suggest, if you continue to have problems, that you start to eliminate the other devices, if you can, during a testing...