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<i>… &nbsp;connected to Ethernet via IP phone</i> &nbsp; &lt;-- I think you must mean iPhone is connected by USB? &nbsp; <br />
<br />
OR, is your iPhone not connected by wire and you are using a Hotspot? &nbsp; This is normal.<br />
<br />
Open cmd.exe with Run as Administrator. &nbsp;Run:<br />
<br />
Netsh Wlan show profiles <br />
<br />
There should be a profile for your iPhone. &nbsp;Delete this. &nbsp;Netsh wlan delete profile name=&quot;iPhone profile&quot;<br />
<br />
Restart, set the iPhone up again and test.
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…  connected to Ethernet via IP phone   <-- I think you must mean iPhone is connected by USB?  

OR, is your iPhone not connected by wire and you are using a Hotspot?   This is normal.

Open cmd.exe with Run as Administrator.  Run:

Netsh Wlan show profiles

There should be a profile for your iPhone.  Delete this.  Netsh wlan delete profile name="iPhone profile"

Restart, set the iPhone up again and test.

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I am referring to an IP Phone, not iPhone.
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I am referring to an IP Phone, not iPhone.

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You are very welcome and I was pleased to assist you.
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You are very welcome and I was pleased to assist you.

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Unable to type on Windows 10 &nbsp;version 1809, until I restart the system.<br />
Only Skype for Business was running.<br />
<br />
I notice the problem when I am connected to Ethernet via IP phone, never on Wi-Fi.<br />
<br />
Any ideas of what can cause this?
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Unable to type on Windows 10  version 1809, until I restart the system.
Only Skype for Business was running.

I notice the problem when I am connected to Ethernet via IP phone, never on Wi-Fi.

Any ideas of what can cause this?

Unable to type on Windows 10  version 1809, until I restart the system.

Windows 10 is a personal computer operating system featuring the "universal application architecture" (UAP); apps can be designed to run across multiple devices with nearly identical code, including PCs, tablets, smartphones, embedded systems, Xbox One, Surface Hub and HoloLens. Windows 10 also includes a virtual desktop system, a window and desktop management feature called Task View, the Microsoft Edge web browser, support for fingerprint and face recognition login, voice-based search (Cortana), new security features for enterprise environments, and DirectX 12 and WDDM 2.0 to improve the operating system's graphics capabilities for games.

Windows 10

This topic area includes legacy versions of Windows prior to Windows 2000: Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions including Windows Mobile.

Windows OS

Skype is for doing things together, whenever you’re apart. Skype’s text, voice and video make it simple to share experiences with the people that matter to you, wherever they are.

With Skype, you can share a story, celebrate a birthday, learn a language, hold a meeting, work with colleagues – just about anything you need to do together every day. You can use Skype on whatever works best for you - on your phone or computer or a TV with Skype on it. It is free to start using Skype - to speak, see and instant message other people on Skype for example.