Unfortunately we see the next wave of blockchain congestion. > 140k unconfirmed transactions.
In the current version we use fixed mining fee and this is even for normal transaction atm too low.
If the transaction has more inputs as usual the fee/size gets even lower.
We have already implemented dynamic fees with a fee estimation service thought that is part of the next release with tons of other changes and is still not ready and needs a lot of testing, so that will require more time.
To get an intermediate solution I decided to make another "softfork" release with changing the trade tx fee to 0.0015 BTC. With that fee we are with current fee prices above average (200-450 Sat/byte) but I fear in 1 month that might be already average fee price if the congestion increase continues like in the last months.
As with the last release when we changed the fees it is a trade protocol change and a kind of "softfork". So the current offers are still valid but users who have updated cannot take those offers as the fee would not match (both traders need to use the same fee).
So it is recommended to remove the offers and set up new offers with the new release.
I am very sorry about that but I think we are not the only one who suffer from those problems.
For all those who have trades with not confirming transactions:
You don't need to open a dispute, you also can wait until it gets confirmed and then continue the trade. If you open a dispute we still need to wait and after it is confirmed both trader can choose to continue the trade or cancel.