Please assist to verify the following:
1. Check if the network is slow outside of VDI?
2. Check if only Office applications appear to be affected and randomly freeze, while other applications do not hang?
3. Check if other users on the same network are having the same issue?
You can open a case with us at https://support.ishinecloud.sg/, contact Support @ 6786 1138 or email to Support@ishinecloud.sg with the above findings.