When replacing computer parts, it's best practice to select replacements that are identical to the original. Otherwise, you might get unexpected results.
According to the documentation for the device, it comes with a 1.86GHz processor and 533MHz memory sticks. However, you replaced these with a 1.66 GHz processor and 800 MHz memory sticks.
Try finding another T1350 processor (they've been discontinued by Intel, but may still be sold on Amazon or eBay), and 533MHz memory. This may make your device more stable.