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What build of Sync3 are you on?  The highest Ford supported release for a 2018 is 3.0.23219

What version Sync3 do you have?  Over the air updates for Sync 3 are spotty at best and, even when activated, rarely actually work.   Have you tried a Master Reset?  This will set all the options back to factory defaults and possibly clear some issues.

When starting my 2018 For F150 Lariat, the sync system is not holding last source or channel.  Truck has a new battery and have evem tried it with a charge attached. Is this requiring a purchase of a new APIM or a repair?  If so, what and who is recommended or can I do a self repair?  I get the turn on following features scree for updates, location and data sharing, automatic updates and sync updates: on, and then sync can check for updates screens before even getting to the home screen where it goes to an AM station and not the last station listened to. And when you select raio ypu have to select the source. This occurs every time. 

In 2010 Fusion, Sync was  unavailable on the base "S" trim, and standard on the higher-end SEL, Sport, and Hybrid trims. But on the SE, it was avaliable with a special trim package.   Because it was optional in your model year/trim, the easiest way to tell is by looking at the right-hand side of the steering wheel. If your the car has SYNC installed, you will see buttons featuring a "Media" track control, a phone icon, and a "Voice/Speak" icon (a profile of a face with sound waves).

Date in error. The date on your car is automatically pulled from GPS.   GPS satellites reset their calendar tracking every 19.7 years due to a computer programming limitation known as the "GPS Week Number Rollover."   The system tracks dates by counting weeks rather than months or years, and the legacy data format assigns only 10 binary bits of data to this week counter     A binary system stores information as 1s and 0s. Because the original military engineers allocated a 10-bit string for the week counter, the maximum number of unique values that can be expressed is 2¹⁰, which equals 1,024 weeks.   Once the system reaches week 1,023, the counter experiences an integer overflow and mechanically rolls back to week 0.    This is just normal behavior for the satellites. The actual issue lies with ground-based GPS receivers (Fords implementation in their software.)   Ford's firmware was never programmed to anticipate the reset, and it interprets the "Week 0" signal literally.    In newer satellites they fixed this by changing the week counter to 13 bits. This allowed the system to count up to 8,192 weeks (2¹³), extending the timeline to 157 years.    Because of this hardcoded tech limitation, your car's calendar permanently reset itself back to December 2005.   Ford never released software update for the older navigation modules. (Basically a single line of code would fix.)   Only fixes are, 1. Change the system settings from time and date to time only. 2. New head unit.   

Hello.   Going to the recommended website to check for updates is best.  The latest version of Sync 3.4 is 23188.  This version is very stable and provided many fixes from  previous versions.   Also, if you have built-in navigation, you can go here (https://syncnavigation.com/ford/home) for the latest map update which is separate from the Sync update.  These come out annually about this time.  The latest just came out a few weeks ago.  Most likely you'll have to pay for any map updates. (Sync updates are no charge.)   When updating via USB, be sure to follow the instructions exactly.  Sometimes, when updating Sync or Maps, you'll get a 'Complete' message fairly quickly, even when there is more to update.  Be sure that the system no longer restarts on its own before removing the USB and you should be good.  USB updates can take up to an hour or so complete.