I'm just wondering about being tagged somehow and that this is the reason for all the cancellations .
While it's easy to think this, given what you're seeing, don't take it personal. If you get booted-and you'll see a message to that effect-that's a sign you're not wanted. But players coming and going in the lobby is a fact of life in MP games.
Some don't like the course, some don't like the greens they'd have to play on with a higher tier, the timer, the format, the mix of tiers and so on. There's also a bug in the lobby when, if you're sitting 3 or 4th and the player ahead of you declines, you'll get booted.
You can't get "tagged" here so it ain't you. ;-)