When uploading code to the ATtiny85 (on a Digispark USB board) with the Arduino IDE (1.8.2) I get the following error about ~ half of the times:

erasing: 65% complete
>> Flash erase error -32 has occured ...
>> Please unplug the device and restart the program.

When I try again (sometimes need to repeat a few times), it works without problems. Is there anything I can do to improve this?

(While it always works in the end, it's annoying to have to unplug and replug the device for each retry.)

The line used by the Arduino IDE to flash the device is

.arduino15/packages/digistump/tools/micronucleus/2.0a4/launcher -cdigispark --timeout 60 -Uflash:w:...:i 

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