Hyundai I20 engine problem

Hello everyone! I have a 2018 Hyundai i20 with a 1.0 hybrid engine. At speeds above 70–80 (with at least 2500 RPM in 5th–6th gears), it sometimes jerks strangely when I try to accelerate. It feels like the throttle cuts out for a second.

Has anyone experienced this? How can it be fixed? Replacing the spark plugs didn’t solve the problem.

Thanks in advance!