** Shares of Roomba vacuum cleaner maker iRobot's IRBT.O sink 35% to $4.12 premarket
** IRBT expresses going concern doubts and pursues strategic alternatives
** Co appoints Neal Goldman to its board
** IRBT posts Q4 revenue of $172.03 million, missing analysts' average estimate of $180.84 million, as per data compiled by LSEG
** Co reports Q4 loss of $77.10 million, compared to $63.59 million in the previous year
** Canaccord Genuity and BofA Securities are serving as financial advisors for strategic review -IRBT
** IRBT stock down 41% in the past 12 months
(Reporting by Padmanabhan Ananthan)
((Padmanabhan.Ananthan@thomsonreuters.com))