I have had this problem for quite some time. my MacBook pro Retina early 2015 takes forever to start up.duribg startup the keyboard seems to be unresponsive to eg.cmd+alt+p+r or any other working key combination.when finally login screen appears I cannot input the password since the keyboard is still unresponsive.plugging external keyboard helps but only sometimes.after it successfully logged in everything is back to normal and the keyboard works perfectly.thisnproblem was also present before updating to Mojave.does anyone have similar problems or knows what's wrong? thanks for any comments on this

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