It's not you...it's Ebay. Their boards are FULL of these stories. Same here, either no sales at all or a bunch in one day (and they'll all be from the same state...that CAN'T be a coincidence)
I gave up on auctions, it's like giving stuff away. If I list an auction for $10 (for example) it might or might not get one bid. If I list it as a BIN for $35 it will sell for sure, just takes longer.
There are alot of theories that make sense...Cassini search engine, rolling blackouts (we've all experienced those) and lately. mobile shoppers. Ppl who shop from their phones are more likely to see listings POSTED from phones, at least this is what I read but it makes sense to me. It would explain alot. And of course alot of ppl don't know how to sort and are browsing Best Match and we all know what a mess that is.
Just my two cents