Should brainstorming sessions be held regularly to build healthy employee-customer relations?

Thanks 

Yes, every month, in order to get new idea from employees and enhance the achievements  

Sure once time in per month to built a A leading figure on them

100 percent!!! All work environments need a collaborative force to deliver the best result.

Brainstorming can help you generate radical solutions to problems. It can also encourage people to commit to solutions, because they have provided input and played a role in developing them. The best approach combines individual and group brainstorming. It is one of the most creative ways of solving problems. However, it may not always be used to solve a single problem. It is sometimes used to come up with a list of possible solutions that can be used to solve a problem.

Yes regularly, to keep all employees seeking participation in that session also execute what is relevant to work and praise innovation

yes, it is very necessary.

it should be once in a week in free air space

it should be only in case any change in product / operations management policy Secondly departmental presentation and review by MIS section are key indicators of company growth achievements

Yes. This will update the candidate and well wersed with products

Not necesary, frequent brainstorming sometimes gives negative result.

Brainstorming can be done for the New business strategy development long or short term once in a year. However, if a company develop a culture of Daily dashboard and war rrom meetings will help all functions to present and understand day o day basis issues and review the solutions and close the issue fast, by sharing the details to all function will help business more transperancy and help to develop confidence and relationship between cross functional team. Every attendee function help to resolve the problem by sharing their ideas.