Problems with Electron Cash SLP wallet

So I had a lot of transactions because of flexUSD. I didn't open my wallet for 3 months. Now it is completely bugged and I can't use it anymore. Altough I downloaded already more than 20 GB (!) of Data from that poor Graph Server it doesn't verify the slp transactions. But also the main transactions don't completely verify, strangely the new and old ones do, but there are some medium old ones that never get verified. Rewrite history function didn't help. Also the whole wallet is very unsresponsive when downloading the graph data.

Anyone a clue what I can do?