Go in C:\AeriaGames\DigimonMasters
or elsewhere wherever u have installed your Digmon Masters game
Right click your GMO and go to properties > compatibility tab > Check the buttons on the screenshot. You should click the "Change settings for all users" if you share your computer/have multiple profiles as well if they play the game.
To me personally it makes the game quite playable with the minor relaunches.
Credits to sang06 for telling me to do this.