BOXLIGHT ProjectoWrite2 User Manual page 100

Troubleshooting
5. Q: Why is the cursor jumping?
A: This may be caused by strong ambient light interference. Try to
avoid strong ambient light interference, especially strong sun light
directly projected on the screen. (Please refer to the Question 3.)
6. Q: Why is the LightPen not working after the computer wakes up
from standby?
A: In some cases, if the computer goes into standby mode, the computer
will shot the USB port. In such case, please wake up computer,
unplug and insert the USB cable again. (Please refer to the Question
2.)
Note:
1. Always use alkaline batteries for the "Pointer" and "Light Pen".
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