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How do I unstake my EOS in simplEOS wallet

I wonder if anyone can resolve my problem or point me in the direction of a solution.
I cannot seem to unstake my EOS in the simplEOS wallet as it keeps giving me a message saying error: billed CPU time (223 us) is greater than the maximum billable CPU time for the transaction ( 5 us).
I have no idea what that means or how to resolve this issue.If anyone does I’d be very grateful to know how.

Should I just get another wallet & if so would I still face the same problem?

Thanks in advance for any help or advice.