Hi captaindc (David) and welcome to Tikiwiki Community
Make a backup of your database first.
Try going to your mysql database through phpmyadmin or similar, and search at your tiki_preferences table
Try to find there any reference to the features you enabled and options you set, etc., that you think that they might be responsible of that behavior, and change them (or remove them) from the tiki_preferences table.
And after you fix the problem, please, fill in a bug report with your problem and how you solved that, so that a coder can improve Tikiwiki performance to avoid this behavior to happen in next releases.