Hello, I'm using LTS 1.11 to control a 8890 GC and 8697 HS. Both 8890 and 8697 are having their latest firmware. The method was set up to have some valve actuations from the GC during data acquisition. At first, whenever a sequence was run, even the whole sequence completed successfully without any errors, the sequence method of the first vial always missed out the valve events, however from the 2nd run onwards all valve events were back as normal. Note that all runs were set to be acquired by the same method. This issue happened everyday for a week, then the week after that was worse as all runs had no valve actuations at all. Does anyone know what could cause the issue ? This never happened for another system, 7890 GC coupled with 7697 HS, in our lab. Thanks.