Dealing with a bad sales week

How often do you just have a bad week? Or is it usually for a reason you have yet to discover?
I haven't had a sale ALL WEEK! I'm by no means a large volume seller but don't recall the last time I went 5 days without a sale. I've just up graded to a store last week but in the same week of doing so sales were great, just this week they suck. So many dramas with ebay lately too; non payers, cancelled auctions, ebay glitches causing items to come up as free postage, potential buyers engaging in haggling wars over $3... Sometimes it just feels too hard!

I think this post is more of a vent than anything else. Thanks for listening.