On these brakes, do you have one moving pad or two?
My advice would be to make sure that the brakes are correctly adjusted (both pads near the disk, but not actually rubbing except in the tiniest way if the disk isn’t completely perfectly flat.
Once the brakes are adjusted, you will occasionally need to readjust. In a brake set up with a fixed and a single moving pad, if both pads are not properly adjusted close to the disk, you will have a lot of brake lever pull involved in simply moving the pad up to the disk. This will make it necessary to keep making adjustments because most of the brake lever movement is being wasted anyway and only the last bit is applying the brakes.
My advice is to make sure they are adjusted properly like I describe in my post to the guy who said he accidentally bought a fake strida on ebay and had trouble with the brakes.