Minimal RAM can do this if there is too much else running at the same time.
Might be worth checking what is running in the background.
If that becomes the answer, then an early dip into your pocket for more RAM might swing the balance.
OnePlus 5 review
Alice Saey's mesmerising animation for Dutch singer Mark Lotterman
iPad Pro 10.5in (2017) review
Comment booster votre iPhone ?