More than half of U.S. major cities showed an increase in foreclosures since the end of last year, according to RealtyTrac.

Mortgage servicers put a freeze on the process in 2010 to correct affidavit problems and resolve investigations from federal regulators and the state attorneys general. A $25 billion settlement approved in March brought new standards and relief requirements for struggling homeowners.

As servicers adjusted, foreclosures began to increase in different areas of the country during the first quarter.

Read More: RealtyTrac: Foreclosures up in more than half of major cities