Can you post some of the addresses you've used?

My guess would be you've been collecting very small amounts from faucets, which is worth less than the fee required to send them again. In other words: it's about worthless now. In the past you could have used it, and maybe you can use it again in the future.
Or, depending on how big your inputs are, you can try consolidating them when the recommended fee is low. Last Sunday 10 sat/byte would have been enough, and even less than that would have worked. This takes patience to do though.