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Several people who own Amazon's Echo speakers have reported a strange bug: The Alexa voice assistant has been laughing for apparently no reason.

Some users on Twitter and Reddit said the outbursts have been entirely spontaneous. Others have said that Alexa has laughed after being asked to turn on the lights — and may have misheard the command.

"Having an office conversation about pretty confidential stuff and Alexa just laughed," Twitter user @DavidSven wrote. "Anybody else ever have that? It didn't chime as if we had accidentally triggered her to wake. She simply just laughed. It was really creepy."

Said another Twitter user, @taylorkatelynne: "so my mom & I are just sitting in the living room, neither of us said a word & our Alexa lit up and laughed for no reason. she didn't even say anything, just laughed. we unplugged her."

Amazon said in a statement that the outbursts are due to its smart speakers hearing accidental orders. "In rare circumstances, Alexa can mistakenly hear the phrase 'Alexa, laugh,' " Amazon said. To fix the issue, Amazon is disabling that command and changing the command to "Alexa, can you laugh?"

Amazon is also changing Alexa's response: rather than have the assistant laugh right away, its cackling will be preceded by the sentence, "Sure, I can laugh."