Data not saved in MYSQL after input in FA

I have a client installation with three companies on FA 2.3.24

The installation worked fine, although it seemed to always had an issue with displaying the sales tab after login. when you refresh then the sales tab would appear, but takes three or four tries sometimes.

At least it saved any new information that was entered. The last two days the system / has a problem to save any information even if done from different browsers and different computers.

I looked through the forum and on the internet but cannot find a workable solution. Tried the php ini file to set different php functions, as well as the htaccess file in FA folder.

Will appreciate the help. Mysql: v 5.5.42-cll PHP version: 5.4.26 ; it is a shared server.

If you add a customer, it seems like the customer was not added, until you refresh the main tab and then it is there.

If you add a supplier, nothing shows and when you refresh the main tab 3 customers with the same name and short name appears.

When trying to add an item, it is not created no matter what I try.

In doing a bank recon, it is not done at all after selecting all the relevant information.

I have my hands in my hair, because time is an issue.

Thanks

Wynand