1. Try playing the game in window mode.
2. Turn on the trainer after you are in the "Prepare" inventory screen.
3. Use the trainer only when you are in the screen and turn off the trainer (exit the trainer) immediately after getting the items you want.
4. Try not to use the trainer when you are scavenging,picking up or searching for items.
5. Avoid using the trainer on Day 1.
6. Avoid using the trainer for lock picks.
7. Avoid increasing too many items at once. (My max was around 60 items per night)
Hope it helps.