A pal says the former Full House star really struggled when his mother died last year

By Julie Jordan
Updated June 17, 2015 08:30 AM
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After being charged with a DUI, John Stamos was hospitalized for an unknown medical condition. Subscribe now for all the details on the arrest and what his friends are saying – only in PEOPLE.

When John Stamos was pulled over in Beverly Hills and charged with a DUI on Friday, friends of the actor were hopeful this was a one-time mistake. Yet “even though John remains confident and cool, there’s been a change in the past two years,” a pal allows in this week’s issue of PEOPLE.

According to the police, Stamos, 51, who was driving erratically, was taken to Cedars Sinai Medical Center and later released. A spokesman for the police department told PEOPLE that the actor was “having a medical condition” and was not given a field sobriety test.

While Stamos’ career has been going strong – he is set to star in and produce the Netflix Full House spin-off, Fuller House, and is the lead in the new Fox sitcom Grandfathered – friends say he really struggled when his mom, Loretta, died last September. “That was crushing for him,” says a member of his circle. “He did his best to stay strong, but he absolutely fell apart.”

For now, friends of the actor, who was spotted at LAX catching a flight to Toronto on June 14, are hoping for the best. “John has always drunk socially,” adds his pal. “At one point, it was a problem. But this is not that time in his life.”

RELATED VIDEO: John Stamos Spotted for First Time Since DUI Arrest

For more on Stamos’ DUI charge and his friends’ reactions, pick up this week’s issue of PEOPLE, on newsstands Friday

Reporting by MELODY CHIU, TIARE DUNLAP, JENNIFER GARCIA and NICOLE SANDS