The problem is on their side, and it happens to often by my opinion. Sometimes it is impossible to connect at all, so they put a message on their site saying "system enhancements in progress". I contacted them once about it, and this is what they wrote back:
"Hello,
Thank you for contacting MANSION.
Further to your recent communication, we can confirm that MANSION is currently enhancing our website and back office systems.
This enhancement in turn will prevent players being able to log into the poker/casino/sportsbook client and may cause temporary loss of service in the cashier or homepage.
If you have been affected by this we sincerely apologise for any inconvenience caused and hope that this will be completed within a number of hours, however there is no set timescale as of yet.
We thank you for your patience and understanding in this matter.
Kindest regards,
Mike
MANSION Member Services "
Bla, bla, bla. Standard BS.
Just clear your bonus and ruuuuun to another site.