Failing to climb hills with gear changing

[row]

Hello all. I have my Cube Bosch bike for one week now. I’m really enjoying it. This is my first time riding an e bike and I’m unsure if the bike is performing as it should on steep hills.

If I’m ascending and I lower the gears the power seems to cut from the motor and I stop. What I need to do is to get in a lower gear on the flat and then begin to climb and then there is no problem, I just can’t change gears on a climb or I get this (cut out?). Is this normal?

The bike has is rear hub Shimano Alfine SG-S7000, 8-Speed –the gears do not always shift fully and I’m thinking this maybe happening more on hills, maybe this is the cause?

Any advice would be appreciated

 

[Artstu]

It's clearly not changing gear under load, there's a knack to it which once mastered is perfectly fine and becomes second nature. It involves a very brief pause of pedalling whilst changing gear, you can often hear the gear-change happen.
I have it off to a tee on my classic Bosch Nexus 8. I imagine the newer Bosch is the same if that's what you have.