Their system is crap, currently it is fixed but in whole December, when I logged into my dashboard, after 5 minutes, suddenly Chrome browser was consuming 8gb+ RAM and 99% CPU.
It's quite similar to what happens when there is being browser mined. Not saying it applies to your case, but it is suspicious. Does the same happen when you visit other sites?
It seems it's a plugin issue or a browser issue, not a Wirex or may be the Wirex dashboard has cookie tracker that I think that's the reason why his CPU usage increased or a crypto miner.
OP should use an anti-miner plugin that focus on browser-based crypto miners.
I always thought that they were pretty well known, but I could be wrong here.
Other people have actually recommended them to me, specifically for their prepaid Bitcoin debit cards.
Again, not sure what to think here.
Wirex is a well-known scam before but there are people telling that it is not a scam I think 40% to 60% telling that it is not a scam so we don't know if the Wirex service is trusted or scam.
However, since their support still active maybe we can still trust their service but not 100% and I heard that there are many Wirex users abuse their service that may cause issues like blocking or locking your account if they detect any suspicious from your account anytime they can lock or block your account.
This is just what I heard from some marketing forum who abuse the Wirex app for making multiple accounts.