I mostly was practicing cash games here but decided to play my first tournament last Sunday. I just now tried to play today's afternoon tournament, but when I clicked on clock to register, nothing happened after several tires. After the countdown clock expired, when I clicked on it again, the tournaments came up, but not the one I that just immediately started. Is there some limit on how many you can play? I have looked everywhere and I can't find any info.
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I wish I could help more, but the only advice I can really give you is to forward you the instructions for how to register for a tournament. Everything you describe at the beginning just sounds like an Internet problem - you might have lost your service for a bit. There isn't any limit on what you can play.
When you go into the tournament area by clicking the clock, one of the links is "help with registering". That provides all the information about how to register for the tournaments. Here is a link to that page: https://www.advancedpokertraining.com/poker/multiplayer/tournament_instructions.php
You should be able to get registered for the next tournament without any trouble with those instructions.