Getting very high latency ~1day for events from IOT hub

I have Azure Functions triggered by events from IOT hub. I am experiencing latencies up to 1 day from event enqueued time to function invocation.

#### Investigative information

Please provide the following:

- Timestamp: 2018-10-28T13:01:39.453Z
- Function App version (1.0 or 2.0): 1.0
- Function App name: Subscription 32483011-f64d-455e-b336-212fa95c1813
- Function name(s) (as appropriate): PlatformEventHandlerColdPath
- Invocation ID: 099c81a9-bd6b-459e-90b2-3712762ed667
- Region: South Central US

#### Expected behavior
Event latency to not exceed e.g. 1 minute

#### Actual behavior
In my function (invocation as above), if I compare DateTime.UtcNow with event enqueued time I get latency of 1day 23 mins.
The actual duration of the call is ~500ms.

#### Related information

* Programming language used: C#
* The function accesses BLOB data is storage account as well as Azure tables. Then does some processing and writes data back into Azure tables.
* I created trace writer to Azure table in order to debug this. Attached is trace output for the above invocation.

[Uploading TraceEntry.xlsx…]()

Start with the reported PlatformEventHandlerColdPath invocation, using the timestamp, invocation ID, region, and attached TraceEntry.xlsx to compare event enqueue and function invocation times. Reproduce or trace the delay in the Azure Functions and IoT Hub path; done means identifying the cause of the nearly one-day latency and documenting a validated resolution.

Written by the indexing model from the issue text.