[Koha] Record display turns completely blank

Hi, Occasionally when we view/create/edit a record, the record page will not display properly, all the field will turn blank, any update to the record just pauses and we need to wait from minutes to hours before it fixes itself and the record to be displayed normally again. It happens from time to time and really impacts our workflow. This is the screenshot of what it looks when it happens: https://www.lib.ntu.edu.tw/AR/images/example.jpg Anyone else experienced this? What could be the cause and what are potential solutions? ________________________________ Mickey Wu National Taiwan University Library IT Services Department No.1 Sec.4, Roosevelt Rd., Taipei, Taiwan Tel. 02-33664573 hsuaniwu@ntu.edu.tw