Magento

i have a magento store and all is running fine. Then suddenly the checkout onepage shows blank. so i reinstalled the payment gateway using connect and all was ok again.... for about an hour or so it then showed blank again so i repeated the process and made orders on a test account and all was ok then after a few hours it went blank again. i then contacted cardsave (payment gateway) and the said it will not be them as there code does not run until the fill the details.

i found that it may be my memory limit on my server so i set it to 900M to be sure and still does not work.
i cant understand how it works fire then just stops.

any help please

this is pretty simple, take a look into your error log
server and magento. you will see some entries related to checkout url or code.

thanks

This is in my exeption.log, What does this mean??

2013-02-13T11:29:47+00:00 ERR (3):
exception ‘Mage_Core_Exception’ with message ‘Invalid webservice adapter specified.’ in /home/ledsave.co.uk/public_html/app/Mage.php:594
Stack trace:
#0 /home/ledsave.co.uk/public_html/app/code/core/Mage/Api/Model/Server.php(127): Mage::throwException(’Invalid webserv...’)
#1 /home/ledsave.co.uk/public_html/api.php(78): Mage_Api_Model_Server->initialize(NULL)
#2 {main}

Does anyone have any idea why this error is showing