Hello @Benjamin_Chia,
Thanks for contacting support, I’d be happy to take a look here. Can you please let me know how you’re mounting your share via SMB? Are you using hostname or IP address? If you are using hostname, can you please try using IP address instead and possibly create a reserved IP address in your Router?
Also, is Windows File Service enabled and which version of SMB are you using? This thread provides some good settings to take a look at for Synology and our NAS troubleshooting guide also provides some great suggestions.
Please let me know the above information when possible and we can continue from there.
Thanks,
Noris