Good morning, @johnbowery Well, I’d say knife juggling as a new hobby is out of the question for you right now. 😉
Thrombocytopenia, which is a term for low platelets, can be caused by an underlying health condition such as a viral infection, autoimmune condition or sometimes certain medications can interfere with platelet production. A low platelet count can also be due to the bone marrow not producing enough platelets or the body destroying or using up the platelets that the bone marrow produces. Also the spleen could be holding onto too many platelets, meaning that the amount in the blood is too low. So your doctor will want to do a little more testing to get to the bottom of your mystery.

I found a couple of good articles for you that help explain why a platelet drop can happen. Here are the links:
https://www.mayoclinic.org/diseases-conditions/thrombocytopenia/diagnosis-treatment/drc-20378298
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https://www.verywellhealth.com/living-with-low-platelets-what-you-need-to-know-2252431
Prior to having the infusions were you taking any medications daily such as acetaminophen, ibuprofen, naproxen or aspirin, antibiotics, etc.? Have you been tested for any autoimmune diseases or have you had any recent viral infections or illnesses?