Map drives dropping out

On Server machine run commands in CMD or Powershell as admin

net config server /autodisconnect:-1

netsh int tcp set global autotuninglevel=disabled                                                                                                                                                               

1. Locate and then click the following key in the registry:
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters
2. In the right pane, click the autodisconnect value, and then on the Edit menu, click Modify.
3. On the Edit menu, click Modify.
4. Click Hexadecimal.
5. In the Value data box, type ffffffff, and then click OK.

• If the autodisconnect value does not exist, follow these steps:
  1. On the Edit menu, point to New, and then click REG_DWORD.
  2. Type autodisconnect, and then press ENTER.
  3. In the Value data box, type ffffffff, and then click OK.