How does an expired restraining order, speeding ticket (paid) and a verbal trespass warning affect my immigration case?

they probably have no affect, however, you should have the restraining order reviewed by an immigration attorney.

I married a women who was in US illegally. She become a legal resident. After few years she went back to her country.

This a question for a domestic relations attorney with possible immigration implications

Check with employer 1's atty. You need to have maintained your status. You may need a new petition

Want to go back to employer A after joining employer B for a week on H1B!

Yes as long as maintaining status and An approved petition or pending petition exists. Check with the employer's attorney

Can I get my h1b visa transferred?

Yes assuming you are in h1b status with a cap subject employer.

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Try again

Can I reopen a case if I did not respond to Immigration due to not receiving a notice?

Possibly. Get legal help.

Can I file for concurrent h1b visa?

It may be possible to do what you are proposing. However, you are likely to have issues particularly based on the question of how you could be in...

Using reference letter for immigrant visa process from an area of a company which has closed

You can use the letter. CI S will Determine how much weight they will give to the letter. CI S may question any and all of your application...

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I'm employed on H1B and have an EAD from GC process. Can I quit H1 job and take up job based on EAD? Do I have to notify USCIS?

Yes you may but you run the risk the permanent residence will be denied. 1. No 2. H1b ends when you stop employment 3. No 4. No 5. Yes