Ethereum system is quite terrible now in terms of pending transactions.
There are over 25k TX waiting in the queue for 2 days.
It is impossible to process under 40 gwei and this is very expensive for token transfers.
What is the cause of it? Again those kitties or something else?
When will it become normal again?
I think there's no particular reason for it, just a large number of transactions being processed in terms of trades etc. Hopefully it can be resolved soon, such things are never sustainable and fortunately solutions are in the pipeline for ethereum and bitcoin, they really can't come soon enough.