The transaction fees have spiked significantly. Now, you need to pay about 120 sat/byte to get a transaction confirmed in the next block.
Yeah, I've noticed that myself. I used Electrum to send a few payments yesterday, and the last one I sent is still stuck in the network--and it's been about 16 hours at a fee of 87sat/byte. Unfortunately it's a low amount that I'm sending so there's no way I'm going to bump the fee any higher.
OP, this is how it is sometimes--especially when the price of bitcoin is going haywire like it is now. People are buying and selling and generally sending a lot more bitcoin than usual, so the network is congested (at least that's how I see it). So either you bump the fee up or exercise some patience. Your transaction will confirm eventually.