Not so happy - Pulsar Trail XP50 1.6-12.8x42mm Thermal Imaging Rifle Scope

I’ve owned my XP50 for just over 2 years and really like the features and options. But I have a big issue with the scope. The problem is I can sight it in and works great. Use it a time or two then find it to be way off. For example I sighted it in last week and was shooting groups in the 1”- 1.5” range. Today I went out and now it’s shooting 3 feet to the right. This is a common issue and is a problem on both AR’s I’ve tried it on. Been in for service once and guess I’ll send it in again next week. Very disappointed.