The two symptoms are probably connected...
There are a number of possible conditions that could cause both symptoms and the possibility two unrelated faults have coincidentally caused them should not be ignored. The possibilities should be carefully checked by a competent person to ensure the cure is no more expensive than it needs to be.
It is possible the cause is a defective cylinder head gasket leaking more combustion gas into the cooling system than the degassing system can cope with or the degassing system itself is defective. It is also possible it is a simple leak and a low coolant level.
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