I don't know why this is happening, but if you need to be sure to run all your tests with the same stability than when you run them separately, then you can create a bat
file (if you're using Windows) like this:
CALL protractor conf.js --specs='tests/test-1-*.js'
CALL protractor conf.js --specs='tests/test-2-*.js'
CALL protractor conf.js --specs='tests/test-3-*.js'
This will solve the problem until you find the root cause.
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