Hi,

You might be calling the write method recursive from the write method, so you are getting the maximum recursion exceeded message. If you are updating the many2many field using write method or using . operator, just try to update the vals.

See sample code below for removing the data from many2many field named tags in res.partner model.

class Partner(models.Model):
    _inherit = 'res.partner'

    @api.multi
    def write(self, vals):
        vals['category_id'] = [(5, 0, 0)]
        res = super(Partner, self).write(vals)
        return res

Thanks