Hi.
Can I assume this is a quartz powered watch? If so, sometimes, if thger bettery is either old or has started leaking hen is causes misfires in the time regulator.. First step would be chasnge battery & resdet the watch & monitor it. If this does not work, then put it into a Tissot service centre. Ifts not a quartz movement, there is no fault in a mechanical movement really that could cause this.
Hope this helps.