My supervisor is a senior Prof at my university, now I'm at the end of my second year of PhD program and passed upgrade in March. In the relationship between my supervisor and I, I always feel frustrated and stressful since he always ignore my meeting emails and Teams messages(shown as read). Sometimes, though we set up a meeting time and add it into the calendar, he's usually late for 20-30mins without informing me or cancel the meeting for a reason. Under this pandemic situation, in the past 5 months, we haven't contacted each other after my upgrade, now he doesn't reply to my email of new meeting again. I know he is quite busy in dealing with teaching sessions and his own research work on the senior Prof role, however, I still feel a bit disrespectful on his behaviors, I'm hesitating between talking with department chair, changing supervisor(may change my research area and delay my progress) and continue working with him.

How should I do? Plz Help Me