Java Download Error 1618

Hi all, I am new to the forum (and to SCCM for the most part), and am encountering some issues during the Operating System Deployment task sequence.
I have the task sequence configured to install applications near the end of the imaging process. I have issues with getting errors during specific package installations, and it gives Error 1618: Installation is already in progress on the next step in the sequence.
This started with just one problem task, and so as a simple fix, I added a system restart after that installation. This fixed the problem, but then another program installation in the task sequence started getting the same problem (when it previous never had this problem). I have been playing tag with this, because every time I fix one, it seems that other ones start happening in a day or two.
Is there any way to ensure that the installation is completed entirely before starting the next step in the task sequence?
So basically, I have one step in the sequence complete successfully (according to the log):
The task sequence execution engine successfully completed the action (Office Web Components 11) in the group (Siemens Soarian) with exit code 0 Action output: re for PackageID='10000031' ProgramID='Install' AdvertID='10020008' has started, jobID='{6FEB0007-D738-4DB3-B331-D0512892659D}' Setting TSEnv variable 'SMSTSInstallSoftwareJobID_10000031_10020008_Install'='{6FEB0007-D738-4DB3-B331-D0512892659D}' Waitingfor installation job to complete.. CompleteExecution received CompleteExecution processed Received job completion notification from Execution Manager Installation completed with exit code 0x00000000 Install successful Setting TSEnv variable 'SMSTSInstallSoftwareJobID_10000031_10020008_Install'=' GetExecRequestMgrInterface successful Releasing job request, jobID='{6FEB0007-D738-4DB3-B331-D0512892659D}' Releasing of Job Request successful CompleteJob successful Entering ReleaseSource() for C:_SMSTaskSequencePackages10000031 reference count 1 for the source C:_SMSTaskSequencePackages10000031 before releasing Delete source directory C:_SMSTaskSequencePackages10000031 Released the resolved source C:_SMSTaskSequencePackages10000031.
Then at the next step, it will error out, saying an installation is in progress:
The task sequence execution engine failed executing the action (MSXML) in the group (Siemens Soarian) with the error code 1618 Action output: all MSXML' AdvertID='10020008' has started, jobID='{65122165-E1D6-4EFE-ABF6-8DDBEE8456BD}' Setting TSEnv variable 'SMSTSInstallSoftwareJobID_10000017_10020008_Install MSXML'='{65122165-E1D6-4EFE-ABF6-8DDBEE8456BD}' Waiting for installation job to complete.. CompleteExecution received CompleteExecution processed Received job completion notification from Execution Manager Installation completed with exit code 0x00000652 Setting TSEnv variable 'SMSTSInstallSoftwareJobID_10000017_10020008_Install MSXML'=' GetExecRequestMgrInterface successful Releasing job request, jobID='{65122165-E1D6-4EFE-ABF6-8DDBEE8456BD}' Releasing of Job Request successful CompleteJob successful Entering ReleaseSource() for C:_SMSTaskSequencePackages10000017 referencecount 1 for the source C:_SMSTaskSequencePackages10000017 before releasing Delete source directory C:_SMSTaskSequencePackages10000017 Released the resolved source C:_SMSTaskSequencePackages10000017 Installation failed with error (0x00000652). The operating system reported error 1618: Another installation is already in progress. Complete that installation before proceeding with this install.
If I can provide any more info to help clarify, please feel free to ask. Thanks in advance!