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It's possible that the site is hanging waiting for GTM to load. Issues: Tracking deliverables across multiple customer divisions, having to go through customer-side project managers who don't understand the questions that are being asked, necessary documents spread all over the place, difficulty in slipping schedules as needed. Good luck!
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If you are going to reach out, I've always found it helpful when a company speaks to their differences and in a positive tone, rather than throwing shade.