Problems with reverse

After 3 months and 4T km, our B-Max 120hp makes the first Mäxchen with the circuit. We knew that the 5-speed transmission could be translated too short and easily tolerate a 6.speed for consumption reduction before the purchase. For a few weeks, however, the reverse movement can often only be inserted in the 2nd attempt after scratching noises. The FH only said that the problems with this transmission are known due to design reasons “reverse gearing right bottom” and one can change nothing. For us a not ak zeptables Manco with an otherwise great car. Who has similar experiences?