The defeat left PSV two points clear of Ajax having played a game more, and continues a bad run of form for the leaders.
“Heerenveen were very good in the first half and put us under pressure,” Advocaat told reporters.
“But it is unbelievable to see how we gave away those goals today. It’s not the first time that’s happened.”
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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.