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PTH12040WAH module turns randomly off for 10ms on certain loads

We use the PTH12040WAH (Vin=12V / Vout=5V) and have the following problem with this module. The module works fine at loads up to 5A with noise around 12mVpp. From 10A to 15A load, we see a lot of noise and spikes on the 5V output voltage  (150mVpp). At these loads, the module powers randomly down the 5 volt output voltage for about 10ms with no obvious reason.  On two of the three MOSFET stages we even see some missing gate pulses to turn off/on the MOSFET's. This probably generates the spikes. At loads around 20A the module seems so work correct again and the noise goes back to around 20mVpp.

Do we have defect modules?

We plan to go into production soon, so fast help is very appreciated.