same here, I just split my transaction by 500 will be accepted but the succeeding transaction you need to lower it to be accepted. in the end, I end up having splitting into 500,300,200.
I hope this is not normal hopefully it can be fix.

Wallet v8.3.17
Trying to transfer lets say 1000 BTQ to my other wallet.
Getting "Transaction too large." error.
Clicking Ok shows "Error: Transaction creation failed!"
Transaction fee is set to 0.00100 BTQ
What am I missing?
Thanks
You can use the "Coin Control" feature to correct this. I will make a document with images explaining how to do this.