There are a few common issues that tend to arise during remote UX testing. One of the biggest challenges is making sure that all participants are able to connect to the testing platform and that the testing platform is stable. This can be a challenge if participants are located in different parts of the world with different internet speeds and connection types.

Another common issue is making sure that participants are engaged and focused during the test. It can be difficult to keep people engaged when they are not in the same room as the rest of the group. This can be overcome by using a moderator who can help keep people on track and engaged.

Another common challenge is making sure that the test scenarios are realistic and representative of the users' actual experience. This can be difficult to achieve when you are not testing in the users' actual environment. This can be overcome by working with experts who understand the users' environment and can help create realistic test scenarios.

Overall, the most common issues that arise during remote UX testing are related to connectivity, engagement, and realism. These can be overcome with careful planning and execution.