Vincent, your crash dumps are not showing any finite probable cause (Stop 0xE1, there should be a device driver behind it, but it is not revealed in the dump) . In such a situation, it is better to enable Driver Verifier to monitor the drivers. Driver Verifier - Enable and Disable
Run Driver Verifier for 24 hours or the occurrence of the next crash, whichever is earlier.
Let us know the results, with the subsequent crash dumps, if any.