Proof of funds for Express Entry

Hi everyone, I’ve seen many posts in forums that said for Fixed Deposits as PoF the certificate should show that the money can be liquidated at any time. I have two Fixed Deposits (3 months term) created since 2012, I can only withdraw the money obviously every 3 months when I decide whether renew it or not, I don’t know if I could get any problem with that? has anyone show Fixed term deposits as PoF and what does the bank letter show? thanks in advance