ATM outage adds to Co-op Bank woes

Britain's Co-Operative Bank was already scrambling to cover an estimated £1 billion to £1.8 billion ($1.3 billion to $2.4 billion) capital shortfall. Then, adding further insult, the bank's ATM fleet experienced a partial shutdown on Sunday.

The Telegraph reported that the problem affected only customers with basic accounts, who represent about 15 percent of the bank's current 1.5 million customers. Of the 15 percent, only 1 percent could not complete ATM transactions or POS sales.

But regardless of amount or duration, the glitch can only cause further unease among investors about the future of a bank under exceptional stress, the Telegraph said.

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