Coral and Ladbrokes poker client

Anyone else play on these sites and have issues with the Windows client?
It runs on the Party poker network but seems to be an older version of that software.
Random issues like very slow to get to login screen, client non responsive while system resources high causing fan to run fast. Tables freezing.

Some times works fine. Other's unusable including having to kill the process in task manager to close. Happens on 2 laptops I use, one of which is high spec with 16GB and SSD. Another lower spec laptop I have works fine. I've not been able to identify the process that's causing the problem but all sorts have been tried including removing and reinstalling the software.

Party poker doesn't have the problem but is a newer client.

Mobile app works ok but less featured.