The Premier League season so far has been characterized by a noticeable downturn in form for the Manager of the Month award winners, suggesting a persistent "curse" has affected the coaches immediately following their accolade.
Four managers have won the award this season, and all four have seen their teams’ performances slump in the subsequent month:

Arne Slot (August Winner): After Slot won the first award, Liverpool’s subsequent month of September included a 1-2 loss to Crystal Palace, marking the beginning of a significant collapse in form later in the month.

Oliver Glasner (September Winner): Following his win, Crystal Palace failed to secure a single victory in October, recording one draw and two losses in their three Premier League fixtures.

Rúben Amorim (October Winner): Amorim's team saw their results rapidly decline in November, managing only one win, two draws, and one defeat across four league games.

Enzo Maresca (November Winner): Maresca's fate was even swifter, with Chelsea’s performance "crashing" before he even officially received the award. In the two Premier League matches played in December, Chelsea recorded one draw and one loss.
This consistent trend highlights a genuine difficulty for the awarded managers to maintain their winning momentum immediately after being recognized.