I just had to contact the customer service again. First it was because transactions were shown as pending for months. They advised me to log out and log back in, which helped. Now I wanted to transfer a bit more than £40 from CB wallet to CB exchange, Etherscan shows 'Status:Success' and the Coinbase wallet tells me 'Status:Confirmed' BUT the money just DISAPPEARED!! This really spooks me out. If they don't give me a sensible explanation for this, I will DEFINETLY never touch their wallet again.