美国采购需求：皮革绘图椅、最佳电脑椅、Boulies 椅、办公接待椅、Workpro 椅、操作员椅

I'm reaching out regarding an issue with a chair I purchased in April 2022. It's been experiencing difficulties lately, specifically with the height adjustment feature. The chair fails to stay at my preferred height and sinks down to the lowest position, making it uncomfortable for daily use. I believe this issue falls under warranty coverage, and I'm looking for a resolution. Could you please provide guidance on how to proceed with the warranty fix? Any assistance you can offer would be greatly appreciated. Thank you!