Oven temperature is going randomly to 'end' condition at beginning of the injection.
1. Check if first oven temperature hold time is set to 0.
2. If yes, the issue is due to a bug in Firmware packages 39 and 37 Upgrade Trace 1300 Firmware with package 46: TRACE 1300 Firmware Package #46 (or higher) using the Trace 1300 Service Tool program: Trace 1300 Service Tool Program (V 3.00.04)
3. If not possible there is a workaround: Set the first oven temperature hold time to a non-zero value (Ex : 0.01 min)