You may increase size of memory inside files but if there is not enough memory on server side, it won't still work. This problem is still related with current server.
We suggest to contact with hosting administrator of if he won't be able to help, change provider. Also you can check Plugins section and deactivate plugins that you don't need and maybe after some plugins deactivation it will be enough memory for options panel.
This means you must definitely contact with hosting administrator because there is not enough ram. Probably server you use is shared between too many users and that's why you got this problem.
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