Hi,
There is no new mechanism for such kind of thing.
We have a plugin, called "Orders Automatic Cancel Plugin" which use the cron task to cancel orders after a specified number or hours/days.
If you have published that plugin (manually, the updates does not publish plugins), or if that plugin was published since the beginning but you haven't activated your cron task before (so it wasn't triggered) ; it could explain your "issue".
Otherwise please provide details about your website, the payment method you're using and some details about the orders which are being cancelled (the order history).
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.