Stock 5.1.1 killing apps that should be persistent

Updated to stock 5.1.1 on my note 4 n910u variant last week, and I noticed that it kills apps that are suppose to stay in memory,like Adguard or pintasking. This was not an issue on 5.0.1 and I'd like to know if anyone has observed this.

I'm not running any task killing apps or Xposed modules.

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