Hi,
HikaShop is probably the biggest extension that you have on your website so it's no wonder that you can get errors that you don't have with other extensions since the installation of HikaShop will require more resources, do more things, etc.
If automatic updates don't work, you can manually update HikaShop.
Simply download the installation package of the latest version via the menu Your account>Your subscriptions on our website and install it via the joomla installer and that will update your HikaShop without loosing data or settings, like when you do it via the joomla udpater.