Problems with selespeed

We have the following problem with our 147 2.0 Selespeed: When starting you want to insert the first gear, but you can’t! the only thing that still goes, the backward gear… If you’re lucky, the first gear then VIELLEICHT goes in after several times starting, if not, the towing machine (at least 7x happens) the whole electronics has been changed, the gear sealed for water, the body computer 2x changed etc. everything already tried… is the same every time you’re lucky he drives himself 2 months without problems… and the hammer is, if you leave him standing, he often works perfectly the next day! someone suspect, or the same problem?